638 lines
18 KiB
C++
638 lines
18 KiB
C++
//
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// "$Id: Fl_Browser_.cxx,v 1.8 1999/01/07 19:17:17 mike Exp $"
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//
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// Base Browser widget class for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-1999 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems to "fltk-bugs@easysw.com".
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//
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#include <FL/Fl.H>
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#include <FL/Fl_Widget.H>
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#include <FL/Fl_Browser_.H>
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#include <FL/fl_draw.H>
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// This is the base class for browsers. To be useful it must be
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// subclassed and several virtual functions defined. The
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// Forms-compatable browser and the file chooser's browser are
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// subclassed off of this.
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// Yes, I know this should be a template...
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// This has been designed so that the subclass has complete control
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// over the storage of the data, although because next() and prev()
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// functions are used to index, it works best as a linked list or as a
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// large block of characters in which the line breaks must be searched
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// for.
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// A great deal of work has been done so that the "height" of a data
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// object does not need to be determined until it is drawn. This was
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// done for the file chooser, because the height requires doing stat()
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// to see if the file is a directory, which can be annoyingly slow
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// over the network.
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/* redraw bits:
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1 = redraw children (the scrollbar)
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2 = redraw one or two items
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4 = redraw all items
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*/
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static void scrollbar_callback(Fl_Widget* s, void*) {
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((Fl_Browser_*)(s->parent()))->position(int(((Fl_Scrollbar*)s)->value()));
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}
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static void hscrollbar_callback(Fl_Widget* s, void*) {
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((Fl_Browser_*)(s->parent()))->hposition(int(((Fl_Scrollbar*)s)->value()));
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}
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int Fl_Browser_::scrollbar_width_ = 17;
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// return where to draw the actual box:
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void Fl_Browser_::bbox(int& X, int& Y, int& W, int& H) const {
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Fl_Boxtype b = box() ? box() : FL_DOWN_BOX;
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X = x()+Fl::box_dx(b);
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Y = y()+Fl::box_dy(b);
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W = w()-Fl::box_dw(b);
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H = h()-Fl::box_dh(b);
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if (scrollbar.visible()) {
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W -= scrollbar_width_;
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if (scrollbar.align() & FL_ALIGN_LEFT) X += scrollbar_width_;
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}
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if (hscrollbar.visible()) {
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H -= scrollbar_width_;
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if (scrollbar.align() & FL_ALIGN_TOP) Y += scrollbar_width_;
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}
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}
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int Fl_Browser_::leftedge() const {
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int X, Y, W, H; bbox(X, Y, W, H);
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return X;
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}
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// the scrollbars are resized & placed by draw(), since each one's size
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// depends on whether the other is visible or not. This skips over
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// Fl_Group::resize since it moves the scrollbars uselessly.
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void Fl_Browser_::resize(int X, int Y, int W, int H) {
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Fl_Widget::resize(X, Y, W, H);
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}
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// Cause minimal update to redraw the given item:
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void Fl_Browser_::redraw_line(void* l) {
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if (!redraw1 || redraw1 == l) {redraw1 = l; damage(FL_DAMAGE_EXPOSE);}
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else if (!redraw2 || redraw2 == l) {redraw2 = l; damage(FL_DAMAGE_EXPOSE);}
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else damage(FL_DAMAGE_SCROLL);
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}
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// Figure out top() based on position():
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void Fl_Browser_::update_top() {
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if (!top_) top_ = item_first();
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if (position_ != real_position_) {
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void* l;
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int ly;
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int y = position_;
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// start from either head or current position, whichever is closer:
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if (!top_ || y <= (real_position_/2)) {
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l = item_first();
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ly = 0;
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} else {
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l = top_;
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ly = real_position_-offset_;
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}
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if (!l) {
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top_ = 0;
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offset_ = 0;
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real_position_ = 0;
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} else {
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int h = item_quick_height(l);
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// step through list until we find line containing this point:
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while (ly > y) {
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void* l1 = item_prev(l);
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if (!l1) {ly = 0; break;} // hit the top
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l = l1;
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h = item_quick_height(l);
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ly -= h;
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}
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while ((ly+h) <= y) {
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void* l1 = item_next(l);
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if (!l1) {y = ly+h-1; break;}
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l = l1;
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ly += h;
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h = item_quick_height(l);
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}
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// top item must *really* be visible, use slow height:
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for (;;) {
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h = item_height(l);
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if ((ly+h) > y) break; // it is big enough to see
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// go up to top of previous item:
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void* l1 = item_prev(l);
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if (!l1) {ly = y = 0; break;} // hit the top
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l = l1; y = position_ = ly = ly-item_quick_height(l);
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}
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// use it:
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top_ = l;
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offset_ = y-ly;
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real_position_ = y;
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}
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damage(FL_DAMAGE_SCROLL);
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}
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}
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// Change position(), top() will update when update_top() is called
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// (probably by draw() or handle()):
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void Fl_Browser_::position(int y) {
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if (y < 0) y = 0;
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if (y == position_) return;
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position_ = y;
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if (y != real_position_) redraw_lines();
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}
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void Fl_Browser_::hposition(int x) {
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if (x < 0) x = 0;
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if (x == hposition_) return;
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hposition_ = x;
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if (x != real_hposition_) redraw_lines();
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}
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// Tell whether item is currently displayed:
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int Fl_Browser_::displayed(void* x) const {
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int X, Y, W, H; bbox(X, Y, W, H);
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int yy = H+offset_;
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for (void* l = top_; l && yy > 0; l = item_next(l)) {
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if (l == x) return 1;
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yy -= item_height(l);
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}
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return 0;
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}
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// Insure this item is displayed:
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// Messy because we have no idea if it is before top or after bottom:
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void Fl_Browser_::display(void* x) {
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update_top();
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if (x == item_first()) {position(0); return;}
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int X, Y, W, H; bbox(X, Y, W, H);
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void* l = top_;
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Y = -offset_;
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// see if it is at the top or just above it:
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if (l == x) {position(real_position_+Y); return;} // scroll up a bit
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void* lp = item_prev(l);
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if (lp == x) {position(real_position_+Y-item_quick_height(lp)); return;}
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// search forward for it:
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for (; l; l = item_next(l)) {
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int h1 = item_quick_height(l);
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if (l == x) {
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if (Y <= H) { // it is visible or right at bottom
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Y = Y+h1-H; // find where bottom edge is
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if (Y > 0) position(real_position_+Y); // scroll down a bit
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} else {
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position(real_position_+Y-(H-h1)/2); // center it
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}
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return;
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}
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Y += h1;
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}
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// search backward for it, if found center it:
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l = lp;
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Y = -offset_;
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for (; l; l = item_prev(l)) {
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int h1 = item_quick_height(l);
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Y -= h1;
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if (l == x) {
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if ((Y + h1) >= 0) position(real_position_+Y);
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else position(real_position_+Y-(H-h1)/2);
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return;
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}
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}
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}
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// redraw, has side effect of updating top and setting scrollbar:
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void Fl_Browser_::draw() {
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int drawsquare = 0;
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if (damage() & FL_DAMAGE_ALL) { // redraw the box if full redraw
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Fl_Boxtype b = box() ? box() : FL_DOWN_BOX;
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draw_box(b, x(), y(), w(), h(), color());
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drawsquare = 1;
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}
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update_top();
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int full_width_ = full_width();
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int full_height_ = full_height();
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int X, Y, W, H; bbox(X, Y, W, H);
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J1:
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// see if scrollbar needs to be switched on/off:
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if ((has_scrollbar_ & VERTICAL) && (
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(has_scrollbar_ & ALWAYS_ON) || position_ || full_height_ > H)) {
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if (!scrollbar.visible()) {scrollbar.set_visible(); drawsquare = 1;}
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} else {
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top_ = item_first(); real_position_ = offset_ = 0;
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if (scrollbar.visible()) {
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scrollbar.clear_visible();
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clear_damage(damage()|FL_DAMAGE_SCROLL);
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}
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}
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if ((has_scrollbar_ & HORIZONTAL) && (
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(has_scrollbar_ & ALWAYS_ON) || hposition_ || full_width_ > W)) {
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if (!hscrollbar.visible()) {hscrollbar.set_visible(); drawsquare = 1;}
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} else {
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real_hposition_ = 0;
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if (hscrollbar.visible()) {
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hscrollbar.clear_visible();
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clear_damage(damage()|FL_DAMAGE_SCROLL);
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}
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}
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bbox(X, Y, W, H);
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fl_clip(X, Y, W, H);
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// for each line, draw it if full redraw or scrolled. Erase background
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// if not a full redraw or if it is selected:
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void* l = top();
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int yy = -offset_;
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for (; l && yy < H; l = item_next(l)) {
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int hh = item_height(l);
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if (hh <= 0) continue;
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if ((damage()&(FL_DAMAGE_SCROLL|FL_DAMAGE_ALL)) || l == redraw1 || l == redraw2) {
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if (item_selected(l)) {
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fl_color(selection_color());
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fl_rectf(X, yy+Y, W, hh);
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} else if (!(damage()&FL_DAMAGE_ALL)) {
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fl_color(color());
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fl_rectf(X, yy+Y, W, hh);
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}
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if (type() == FL_MULTI_BROWSER && l == selection_) {
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fl_color(textcolor());
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fl_rect(X+1, yy+Y, W-2, hh);
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}
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item_draw(l, X-hposition_, yy+Y, W, hh);
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int w = item_width(l);
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if (w > max_width) {max_width = w; max_width_item = l;}
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}
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yy += hh;
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}
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// erase the area below last line:
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if (!(damage()&FL_DAMAGE_ALL) && yy < H) {
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fl_color(color());
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fl_rectf(X, yy+Y, W, H-yy);
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}
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fl_pop_clip();
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redraw1 = redraw2 = 0;
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// see if changes to full_height caused by calls to slow_height
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// caused scrollbar state to change, in which case we have to redraw:
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full_height_ = full_height();
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full_width_ = full_width();
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if ((has_scrollbar_ & VERTICAL) && (
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(has_scrollbar_ & ALWAYS_ON) || position_ || full_height_>H)) {
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if (!scrollbar.visible()) goto J1;
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} else {
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if (scrollbar.visible()) goto J1;
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}
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if ((has_scrollbar_ & HORIZONTAL) && (
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(has_scrollbar_ & ALWAYS_ON) || hposition_ || full_width_>W)) {
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if (!hscrollbar.visible()) goto J1;
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} else {
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if (hscrollbar.visible()) goto J1;
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}
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// update the scrollbars and redraw them:
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int dy = top_ ? item_quick_height(top_) : 0; if (dy < 10) dy = 10;
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if (scrollbar.visible()) {
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scrollbar.damage_resize(
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scrollbar.align()&FL_ALIGN_LEFT ? X-scrollbar_width_ : X+W,
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Y, scrollbar_width_, H);
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scrollbar.value(position_, H, 0, full_height_);
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scrollbar.linesize(dy);
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if (drawsquare) draw_child(scrollbar);
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else update_child(scrollbar);
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}
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if (hscrollbar.visible()) {
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hscrollbar.damage_resize(
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X, scrollbar.align()&FL_ALIGN_TOP ? Y-scrollbar_width_ : Y+H,
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W, scrollbar_width_);
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hscrollbar.value(hposition_, W, 0, full_width_);
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hscrollbar.linesize(dy);
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if (drawsquare) draw_child(hscrollbar);
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else update_child(hscrollbar);
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}
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// draw that little square between the scrollbars:
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if (drawsquare && scrollbar.visible() && hscrollbar.visible()) {
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fl_color(parent()->color());
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fl_rectf(scrollbar.x(), hscrollbar.y(), scrollbar_width_,scrollbar_width_);
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}
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real_hposition_ = hposition_;
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}
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// Quick way to delete and reset everything:
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void Fl_Browser_::new_list() {
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top_ = 0;
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position_ = real_position_ = 0;
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hposition_ = real_hposition_ = 0;
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selection_ = 0;
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offset_ = 0;
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max_width = 0;
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max_width_item = 0;
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redraw_lines();
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}
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// Tell it that this item is going away, and that this must remove
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// all pointers to it:
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void Fl_Browser_::deleting(void* l) {
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if (displayed(l)) redraw_lines();
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if (l == selection_) selection_ = 0;
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if (l == top_) {
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real_position_ -= offset_;
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offset_ = 0;
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top_ = item_next(l);
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if (!top_) top_ = item_prev(l);
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}
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if (l == max_width_item) {max_width_item = 0; max_width = 0;}
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}
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void Fl_Browser_::replacing(void* a, void* b) {
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redraw_line(a);
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if (a == selection_) selection_ = b;
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if (a == top_) top_ = b;
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if (a == max_width_item) {max_width_item = 0; max_width = 0;}
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}
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void Fl_Browser_::inserting(void* a, void* b) {
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if (displayed(a)) redraw_lines();
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if (a == top_) top_ = b;
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}
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void* Fl_Browser_::find_item(int my) {
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update_top();
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int X, Y, W, H; bbox(X, Y, W, H);
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void* l;
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int yy = Y-offset_;
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for (l = top_; l; l = item_next(l)) {
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int hh = item_height(l); if (hh <= 0) continue;
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yy += hh;
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if (my <= yy || yy>=(Y+H)) return l;
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}
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return 0;
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}
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int Fl_Browser_::select(void* l, int i, int docallbacks) {
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if (type() == FL_MULTI_BROWSER) {
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if (selection_ != l) {
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if (selection_) redraw_line(selection_);
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selection_ = l;
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redraw_line(l);
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}
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if ((!i)==(!item_selected(l))) return 0;
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item_select(l, i);
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redraw_line(l);
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} else {
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if (i && selection_ == l) return 0;
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if (!i && selection_ != l) return 0;
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if (selection_) {
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item_select(selection_, 0);
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redraw_line(selection_);
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selection_ = 0;
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}
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if (i) {
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item_select(l, 1);
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selection_ = l;
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redraw_line(l);
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display(l);
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}
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}
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Fl::event_clicks(0);
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if (docallbacks) do_callback();
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return 1;
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}
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int Fl_Browser_::deselect(int docallbacks) {
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if (type() == FL_MULTI_BROWSER) {
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int change = 0;
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for (void* p = item_first(); p; p = item_next(p))
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change |= select(p, 0, docallbacks);
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return change;
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} else {
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if (!selection_) return 0;
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item_select(selection_, 0);
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redraw_line(selection_);
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selection_ = 0;
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return 1;
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}
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}
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int Fl_Browser_::select_only(void* l, int docallbacks) {
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if (!l) return deselect(docallbacks);
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int change = 0;
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if (type() == FL_MULTI_BROWSER) {
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for (void* p = item_first(); p; p = item_next(p))
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if (p != l) change |= select(p, 0, docallbacks);
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}
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change |= select(l, 1, docallbacks);
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display(l);
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return change;
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}
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int Fl_Browser_::handle(int event) {
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// must do shortcuts first or the scrollbar will get them...
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if (event == FL_SHORTCUT && type() >= FL_HOLD_BROWSER) {
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void* l1 = selection_;
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void* l = l1; if (!l) l = top_; if (!l) l = item_first();
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if (l) {
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if (type()==FL_HOLD_BROWSER) switch (Fl::event_key()) {
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case FL_Down:
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while ((l = item_next(l)))
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if (item_height(l)>0) {select_only(l, 1); break;}
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return 1;
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case FL_Up:
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while ((l = item_prev(l))) if (item_height(l)>0) {
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select_only(l, 1); break;}
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return 1;
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} else switch (Fl::event_key()) {
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case FL_Enter:
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select_only(l, 1);
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return 1;
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case ' ':
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selection_ = l;
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select(l, !item_selected(l), 1);
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return 1;
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case FL_Down:
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while ((l = item_next(l))) {
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if (Fl::event_state(FL_SHIFT|FL_CTRL))
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select(l, l1 ? item_selected(l1) : 1, 1);
|
|
if (item_height(l)>0) goto J1;
|
|
}
|
|
return 1;
|
|
case FL_Up:
|
|
while ((l = item_prev(l))) {
|
|
if (Fl::event_state(FL_SHIFT|FL_CTRL))
|
|
select(l, l1 ? item_selected(l1) : 1, 1);
|
|
if (item_height(l)>0) goto J1;
|
|
}
|
|
return 1;
|
|
J1:
|
|
if (selection_) redraw_line(selection_);
|
|
selection_ = l; redraw_line(l);
|
|
display(l);
|
|
return 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (Fl_Group::handle(event)) return 1;
|
|
int X, Y, W, H; bbox(X, Y, W, H);
|
|
int my;
|
|
static char change;
|
|
static char whichway;
|
|
static int py;
|
|
switch (event) {
|
|
case FL_PUSH:
|
|
if (!Fl::event_inside(X, Y, W, H)) return 0;
|
|
if (type() == FL_SELECT_BROWSER) deselect();
|
|
my = py = Fl::event_y();
|
|
change = 0;
|
|
if (type() == FL_NORMAL_BROWSER || !top_)
|
|
;
|
|
else if (type() == FL_MULTI_BROWSER) {
|
|
void* l = find_item(my);
|
|
whichway = 1;
|
|
if (Fl::event_state(FL_SHIFT|FL_CTRL)) { // toggle selection:
|
|
if (l) {
|
|
whichway = !item_selected(l);
|
|
change = select(l, whichway, when() & FL_WHEN_CHANGED);
|
|
}
|
|
} else {
|
|
change = select_only(l, when() & FL_WHEN_CHANGED);
|
|
}
|
|
} else {
|
|
change = select_only(find_item(my), when() & FL_WHEN_CHANGED);
|
|
}
|
|
return 1;
|
|
case FL_DRAG:
|
|
// do the scrolling first:
|
|
my = Fl::event_y();
|
|
if (my < Y && my < py) {
|
|
int p = real_position_+my-Y;
|
|
if (p<0) p = 0;
|
|
position(p);
|
|
} else if (my > (Y+H) && my > py) {
|
|
int p = real_position_+my-(Y+H);
|
|
int h = full_height()-H; if (p > h) p = h;
|
|
if (p<0) p = 0;
|
|
position(p);
|
|
}
|
|
if (type() == FL_NORMAL_BROWSER || !top_)
|
|
;
|
|
else if (type() == FL_MULTI_BROWSER) {
|
|
void* l = find_item(my);
|
|
void* t; void* b; // this will be the range to change
|
|
if (my > py) { // go down
|
|
t = selection_ ? item_next(selection_) : 0;
|
|
b = l ? item_next(l) : 0;
|
|
} else { // go up
|
|
t = l;
|
|
b = selection_;
|
|
}
|
|
for (; t && t != b; t = item_next(t))
|
|
change |= select(t, whichway, when() & FL_WHEN_CHANGED);
|
|
if (l) selection_ = l;
|
|
} else {
|
|
void* l1 = selection_;
|
|
void* l =
|
|
(Fl::event_x()<x() || Fl::event_x()>x()+w()) ? selection_ :
|
|
find_item(my);
|
|
select_only(l, when() & FL_WHEN_CHANGED);
|
|
change = (l != l1);
|
|
}
|
|
py = my;
|
|
return 1;
|
|
case FL_RELEASE:
|
|
if (type() == FL_SELECT_BROWSER) {
|
|
void* t = selection_; deselect(); selection_ = t;
|
|
}
|
|
if (change) {
|
|
if (when() & FL_WHEN_RELEASE) do_callback();
|
|
else if (!(when()&FL_WHEN_CHANGED)) set_changed();
|
|
} else {
|
|
if (when() & FL_WHEN_NOT_CHANGED) do_callback();
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
Fl_Browser_::Fl_Browser_(int x, int y, int w, int h, const char* l)
|
|
: Fl_Group(x, y, w, h, l),
|
|
scrollbar(0, 0, 0, 0, 0), // they will be resized by draw()
|
|
hscrollbar(0, 0, 0, 0, 0)
|
|
{
|
|
box(FL_NO_BOX);
|
|
align(FL_ALIGN_BOTTOM);
|
|
position_ = real_position_ = 0;
|
|
hposition_ = real_hposition_ = 0;
|
|
offset_ = 0;
|
|
top_ = 0;
|
|
when(FL_WHEN_RELEASE_ALWAYS);
|
|
selection_ = 0;
|
|
color(FL_WHITE);
|
|
selection_color(FL_SELECTION_COLOR);
|
|
scrollbar.callback(scrollbar_callback);
|
|
//scrollbar.align(FL_ALIGN_LEFT|FL_ALIGN_BOTTOM); // back compatability?
|
|
hscrollbar.callback(hscrollbar_callback);
|
|
hscrollbar.type(FL_HORIZONTAL);
|
|
textfont_ = FL_HELVETICA;
|
|
textsize_ = FL_NORMAL_SIZE;
|
|
textcolor_ = FL_BLACK;
|
|
has_scrollbar_ = BOTH;
|
|
max_width = 0;
|
|
max_width_item = 0;
|
|
end();
|
|
}
|
|
|
|
// Default versions of some of the virtual functions:
|
|
|
|
int Fl_Browser_::item_quick_height(void* l) const {
|
|
return item_height(l);
|
|
}
|
|
|
|
int Fl_Browser_::incr_height() const {
|
|
return item_quick_height(item_first());
|
|
}
|
|
|
|
int Fl_Browser_::full_height() const {
|
|
int t = 0;
|
|
for (void* p = item_first(); p; p = item_next(p))
|
|
t += item_quick_height(p);
|
|
return t;
|
|
}
|
|
|
|
int Fl_Browser_::full_width() const {
|
|
return max_width;
|
|
}
|
|
|
|
void Fl_Browser_::item_select(void*, int) {}
|
|
|
|
int Fl_Browser_::item_selected(void* l) const {return l==selection_;}
|
|
|
|
//
|
|
// End of "$Id: Fl_Browser_.cxx,v 1.8 1999/01/07 19:17:17 mike Exp $".
|
|
//
|