00cb676e11
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2936 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
295 lines
7.8 KiB
C++
295 lines
7.8 KiB
C++
//
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// "$Id: Fl_Slider.cxx,v 1.8.2.10.2.13 2003/01/30 21:42:44 easysw Exp $"
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//
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// Slider widget for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2003 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@fltk.org".
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//
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#include <FL/Fl.H>
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#include <FL/Fl_Slider.H>
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#include <FL/fl_draw.H>
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#include <math.h>
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void Fl_Slider::_Fl_Slider() {
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slider_size_ = 0;
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slider_ = 0; // FL_UP_BOX;
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}
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Fl_Slider::Fl_Slider(int X, int Y, int W, int H, const char* l)
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: Fl_Valuator(X, Y, W, H, l) {
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box(FL_DOWN_BOX);
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_Fl_Slider();
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}
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Fl_Slider::Fl_Slider(uchar t, int X, int Y, int W, int H, const char* l)
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: Fl_Valuator(X, Y, W, H, l) {
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type(t);
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box(t==FL_HOR_NICE_SLIDER || t==FL_VERT_NICE_SLIDER ?
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FL_FLAT_BOX : FL_DOWN_BOX);
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_Fl_Slider();
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}
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void Fl_Slider::slider_size(double v) {
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if (v < 0) v = 0;
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if (v > 1) v = 1;
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if (slider_size_ != float(v)) {
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slider_size_ = float(v);
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damage(FL_DAMAGE_EXPOSE);
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}
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}
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void Fl_Slider::bounds(double a, double b) {
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if (minimum() != a || maximum() != b) {
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Fl_Valuator::bounds(a, b);
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damage(FL_DAMAGE_EXPOSE);
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}
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}
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int Fl_Slider::scrollvalue(int p, int W, int t, int l) {
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// p = position, first line displayed
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// w = window, number of lines displayed
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// t = top, number of first line
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// l = length, total number of lines
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step(1, 1);
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if (p+W > t+l) l = p+W-t;
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slider_size(W >= l ? 1.0 : double(W)/double(l));
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bounds(t, l-W+t);
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return value(p);
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}
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// All slider interaction is done as though the slider ranges from
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// zero to one, and the left (bottom) edge of the slider is at the
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// given position. Since when the slider is all the way to the
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// right (top) the left (bottom) edge is not all the way over, a
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// position on the widget itself covers a wider range than 0-1,
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// actually it ranges from 0 to 1/(1-size).
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void Fl_Slider::draw_bg(int X, int Y, int W, int H) {
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if (!(damage()&FL_DAMAGE_ALL)) { // not a complete redraw
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fl_push_clip(X, Y, W, H);
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draw_box();
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fl_pop_clip();
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} else {
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draw_box();
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}
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Fl_Color black = active_r() ? FL_FOREGROUND_COLOR : FL_INACTIVE_COLOR;
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if (type() == FL_VERT_NICE_SLIDER) {
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draw_box(FL_THIN_DOWN_BOX, X+W/2-2, Y, 4, H, black);
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} else if (type() == FL_HOR_NICE_SLIDER) {
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draw_box(FL_THIN_DOWN_BOX, X, Y+H/2-2, W, 4, black);
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}
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}
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void Fl_Slider::draw(int X, int Y, int W, int H) {
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double val;
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if (minimum() == maximum())
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val = 0.5;
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else {
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val = (value()-minimum())/(maximum()-minimum());
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if (val > 1.0) val = 1.0;
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else if (val < 0.0) val = 0.0;
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}
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int ww = (horizontal() ? W : H);
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int xx, S;
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if (type()==FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
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S = int(val*ww+.5);
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if (minimum()>maximum()) {S = ww-S; xx = ww-S;}
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else xx = 0;
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} else {
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S = int(slider_size_*ww+.5);
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int T = (horizontal() ? H : W)/2+1;
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if (type()==FL_VERT_NICE_SLIDER || type()==FL_HOR_NICE_SLIDER) T += 4;
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if (S < T) S = T;
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xx = int(val*(ww-S)+.5);
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}
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int xsl, ysl, wsl, hsl;
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if (horizontal()) {
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xsl = X+xx;
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wsl = S;
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ysl = Y;
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hsl = H;
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} else {
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ysl = Y+xx;
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hsl = S;
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xsl = X;
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wsl = W;
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}
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draw_bg(X, Y, W, H);
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Fl_Boxtype box1 = slider();
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if (!box1) {box1 = (Fl_Boxtype)(box()&-2); if (!box1) box1 = FL_UP_BOX;}
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if (type() == FL_VERT_NICE_SLIDER) {
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draw_box(box1, xsl, ysl, wsl, hsl, FL_GRAY);
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int d = (hsl-4)/2;
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draw_box(FL_THIN_DOWN_BOX, xsl+2, ysl+d, wsl-4, hsl-2*d,selection_color());
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} else if (type() == FL_HOR_NICE_SLIDER) {
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draw_box(box1, xsl, ysl, wsl, hsl, FL_GRAY);
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int d = (wsl-4)/2;
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draw_box(FL_THIN_DOWN_BOX, xsl+d, ysl+2, wsl-2*d, hsl-4,selection_color());
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} else {
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if (wsl>0 && hsl>0) draw_box(box1, xsl, ysl, wsl, hsl, selection_color());
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}
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draw_label(xsl, ysl, wsl, hsl);
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if (Fl::focus() == this) {
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if (type() == FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) draw_focus();
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else draw_focus(box1, xsl, ysl, wsl, hsl);
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}
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}
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void Fl_Slider::draw() {
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if (damage()&FL_DAMAGE_ALL) draw_box();
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draw(x()+Fl::box_dx(box()),
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y()+Fl::box_dy(box()),
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w()-Fl::box_dw(box()),
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h()-Fl::box_dh(box()));
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}
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int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
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switch (event) {
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case FL_PUSH:
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if (!Fl::event_inside(X, Y, W, H)) return 0;
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handle_push();
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case FL_DRAG: {
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double val;
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if (minimum() == maximum())
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val = 0.5;
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else {
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val = (value()-minimum())/(maximum()-minimum());
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if (val > 1.0) val = 1.0;
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else if (val < 0.0) val = 0.0;
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}
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int ww = (horizontal() ? W : H);
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int mx = (horizontal() ? Fl::event_x()-X : Fl::event_y()-Y);
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int S;
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static int offcenter;
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if (type() == FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
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S = 0;
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if (event == FL_PUSH) {
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int xx = int(val*ww+.5);
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offcenter = mx-xx;
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if (offcenter < -10 || offcenter > 10) offcenter = 0;
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else return 1;
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}
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} else {
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S = int(slider_size_*ww+.5); if (S >= ww) return 0;
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int T = (horizontal() ? H : W)/2+1;
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if (type()==FL_VERT_NICE_SLIDER || type()==FL_HOR_NICE_SLIDER) T += 4;
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if (S < T) S = T;
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if (event == FL_PUSH) {
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int xx = int(val*(ww-S)+.5);
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offcenter = mx-xx;
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if (offcenter < 0) offcenter = 0;
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else if (offcenter > S) offcenter = S;
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else return 1;
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}
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}
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int xx = mx-offcenter;
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double v;
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char tryAgain = 1;
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while (tryAgain)
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{
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tryAgain = 0;
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if (xx < 0) {
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xx = 0;
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offcenter = mx; if (offcenter < 0) offcenter = 0;
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} else if (xx > (ww-S)) {
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xx = ww-S;
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offcenter = mx-xx; if (offcenter > S) offcenter = S;
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}
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v = round(xx*(maximum()-minimum())/(ww-S) + minimum());
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// make sure a click outside the sliderbar moves it:
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if (event == FL_PUSH && v == value()) {
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offcenter = S/2;
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event = FL_DRAG;
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tryAgain = 1;
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}
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}
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handle_drag(clamp(v));
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} return 1;
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case FL_RELEASE:
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handle_release();
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return 1;
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case FL_KEYBOARD :
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switch (Fl::event_key()) {
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case FL_Up:
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if (horizontal()) return 0;
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handle_drag(clamp(increment(value(),-1)));
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handle_release();
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return 1;
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case FL_Down:
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if (horizontal()) return 0;
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handle_drag(clamp(increment(value(),1)));
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handle_release();
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return 1;
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case FL_Left:
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if (!horizontal()) return 0;
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handle_drag(clamp(increment(value(),-1)));
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handle_release();
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return 1;
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case FL_Right:
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if (!horizontal()) return 0;
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handle_drag(clamp(increment(value(),1)));
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handle_release();
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return 1;
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default:
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return 0;
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}
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// break not required because of switch...
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case FL_FOCUS :
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case FL_UNFOCUS :
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if (Fl::visible_focus()) {
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redraw();
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return 1;
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} else return 0;
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case FL_ENTER :
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case FL_LEAVE :
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return 1;
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default:
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return 0;
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}
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}
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int Fl_Slider::handle(int event) {
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if (event == FL_PUSH && Fl::visible_focus()) Fl::focus(this);
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return handle(event,
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x()+Fl::box_dx(box()),
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y()+Fl::box_dy(box()),
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w()-Fl::box_dw(box()),
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h()-Fl::box_dh(box()));
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}
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//
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// End of "$Id: Fl_Slider.cxx,v 1.8.2.10.2.13 2003/01/30 21:42:44 easysw Exp $".
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//
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