7657a2e4a5
Applied some damage bit fixes from Bill Spitzak. git-svn-id: file:///fltk/svn/fltk/trunk@28 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
232 lines
6.6 KiB
C++
232 lines
6.6 KiB
C++
//
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// "$Id: Fl_Slider.cxx,v 1.4 1998/10/21 14:20:22 mike 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 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_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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draw_box(box(), x, y, w, h, color());
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int BW = Fl::box_dx(box());
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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+BW, 4, h-2*BW, FL_BLACK);
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} else if (type() == FL_HOR_NICE_SLIDER) {
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draw_box(FL_THIN_DOWN_BOX, x+BW, y+h/2-2, w-2*BW, 4, FL_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 BW = Fl::box_dx(box());
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int W = (horizontal() ? w : h) - 2*BW;
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int X, S;
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if (type()==FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
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S = int(val*W+.5);
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if (minimum()>maximum()) {S = W-S; X = h-BW-S;}
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else X = BW;
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} else {
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S = int(slider_size_*W+.5);
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int T = (horizontal() ? h : w)/2-BW+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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X = BW+int(val*(W-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+X;
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wsl = S;
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ysl = y+BW;
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hsl = h-2*BW;
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} else {
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ysl = y+X;
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hsl = S;
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xsl = x+BW;
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wsl = w-2*BW;
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}
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if (damage()&FL_DAMAGE_ALL) { // complete redraw
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draw_bg(x, y, w, h);
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} else { // partial redraw, clip off new position of slider
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if (X > BW) {
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if (horizontal()) fl_clip(x, ysl, X, hsl);
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else fl_clip(xsl, y, wsl, X);
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draw_bg(x, y, w, h);
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fl_pop_clip();
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}
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if (X+S < W+BW) {
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if (horizontal()) fl_clip(xsl+wsl, ysl, x+w-BW-xsl-wsl, hsl);
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else fl_clip(xsl, ysl+hsl, wsl, y+h-BW-ysl-hsl);
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draw_bg(x, y, w, h);
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fl_pop_clip();
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}
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}
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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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}
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void Fl_Slider::draw() {
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draw(x(), y(), w(), h());
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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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if (slider_size() >= 1 || minimum()==maximum()) return 1;
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int BW = Fl::box_dx(box());
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int W = (horizontal() ? w : h) - 2*BW;
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int X = (horizontal() ? Fl::event_x()-x : Fl::event_y()-y) - BW;
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int S = int(slider_size_*W+.5);
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int T = (horizontal() ? h : w)/2-BW+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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double v = double(X)/(W-S);
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double sliderwidth = double(S)/(W-S);
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double val = (value()-minimum())/(maximum()-minimum());
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static double offcenter;
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if (event == FL_PUSH) {
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offcenter = v-val;
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if (offcenter < 0) offcenter = 0;
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else if (offcenter > sliderwidth) offcenter = sliderwidth;
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else return 1;
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}
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TRY_AGAIN:
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v -= offcenter;
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if (v < 0) {
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offcenter = v+offcenter;
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if (offcenter<0) offcenter=0;
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v = 0;
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} else if (v > 1) {
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offcenter = v+offcenter-1;
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if (offcenter > sliderwidth) offcenter = sliderwidth;
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v = 1;
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}
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// if (Fl::event_state(FL_SHIFT)) v = val+(v-val)*.05;
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v = round(v*(maximum()-minimum())+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 = sliderwidth/2;
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v = double(X)/(W-S);
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event = FL_DRAG;
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goto TRY_AGAIN;
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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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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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return handle(event, x(), y(), w(), h());
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}
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//
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// End of "$Id: Fl_Slider.cxx,v 1.4 1998/10/21 14:20:22 mike Exp $".
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//
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