a60f99d4a1
Make clear that some alignment bit combinations are "illegal" and yield undefined behavior that can be changed without notice. Fix label alignment in some border cases where illegal bit combinations like FL_ALIGN_LEFT and FL_ALIGN_RIGHT or FL_ALIGN_TOP and FL_ALIGN_BOTTOM are both set, respectively. Todo: There appears to be inconsistent handling WRT these "illegal" cases, for instance with inside labels as opposed to outside labels, such that the behavior seems to be unpredictable. See test/label.cxx. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12181 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
144 lines
4.1 KiB
C++
144 lines
4.1 KiB
C++
//
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// "$Id$"
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//
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// Label drawing routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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// Drawing code for the (one) common label types.
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// Other label types (symbols) are in their own source files
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// to avoid linking if not used.
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#include <FL/Fl.H>
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#include <FL/Fl_Widget.H>
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#include <FL/Fl_Group.H>
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#include <FL/fl_draw.H>
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#include <FL/Fl_Image.H>
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void
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fl_no_label(const Fl_Label*,int,int,int,int,Fl_Align) {}
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void
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fl_normal_label(const Fl_Label* o, int X, int Y, int W, int H, Fl_Align align)
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{
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fl_font(o->font, o->size);
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fl_color((Fl_Color)o->color);
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fl_draw(o->value, X, Y, W, H, align, o->image);
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}
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void
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fl_normal_measure(const Fl_Label* o, int& W, int& H) {
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fl_font(o->font, o->size);
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fl_measure(o->value, W, H);
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if (o->image) {
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int iw = o->image->w(), ih = o->image->h();
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if (o->align_ & FL_ALIGN_IMAGE_BACKDROP) { // backdrop: ignore
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// ignore backdrop image for calculation
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} else if (o->align_ & FL_ALIGN_IMAGE_NEXT_TO_TEXT) { // text and image side by side
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W += iw;
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if (ih > H) H = ih;
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} else {
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if (iw > W) W = iw;
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H += ih;
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}
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}
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}
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#define MAX_LABELTYPE 16
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static Fl_Label_Draw_F* table[MAX_LABELTYPE] = {
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fl_normal_label,
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fl_no_label,
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fl_normal_label, // _FL_SHADOW_LABEL,
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fl_normal_label, // _FL_ENGRAVED_LABEL,
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fl_normal_label, // _FL_EMBOSSED_LABEL,
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fl_no_label, // _FL_MULTI_LABEL,
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fl_no_label, // _FL_ICON_LABEL,
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// FL_FREE_LABELTYPE+n:
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fl_no_label, fl_no_label, fl_no_label,
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fl_no_label, fl_no_label, fl_no_label,
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fl_no_label, fl_no_label, fl_no_label
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};
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static Fl_Label_Measure_F* measure[MAX_LABELTYPE];
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/** Sets the functions to call to draw and measure a specific labeltype. */
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void Fl::set_labeltype(Fl_Labeltype t,Fl_Label_Draw_F* f,Fl_Label_Measure_F*m)
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{
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table[t] = f; measure[t] = m;
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}
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////////////////////////////////////////////////////////////////
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/** Draws a label with arbitrary alignment in an arbitrary box. */
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void Fl_Label::draw(int X, int Y, int W, int H, Fl_Align align) const {
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if (!value && !image) return;
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table[type](this, X, Y, W, H, align);
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}
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/**
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Measures the size of the label.
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\param[in,out] W, H : this is the requested size for the label text plus image;
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on return, this will contain the size needed to fit the label
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*/
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void Fl_Label::measure(int& W, int& H) const {
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if (!value && !image) {
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W = H = 0;
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return;
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}
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Fl_Label_Measure_F* f = ::measure[type]; if (!f) f = fl_normal_measure;
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f(this, W, H);
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}
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/** Draws the widget's label at the defined label position.
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This is the normal call for a widget's draw() method.
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*/
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void Fl_Widget::draw_label() const {
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int X = x_+Fl::box_dx(box());
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int W = w_-Fl::box_dw(box());
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if (W > 11 && align()&(FL_ALIGN_LEFT|FL_ALIGN_RIGHT)) {X += 3; W -= 6;}
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draw_label(X, y_+Fl::box_dy(box()), W, h_-Fl::box_dh(box()));
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}
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/** Draws the label in an arbitrary bounding box.
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draw() can use this instead of draw_label(void) to change the bounding box
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*/
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void Fl_Widget::draw_label(int X, int Y, int W, int H) const {
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// quit if we are not drawing a label inside the widget:
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if ((align()&15) && !(align() & FL_ALIGN_INSIDE)) return;
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draw_label(X,Y,W,H,align());
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}
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/** Draws the label in an arbitrary bounding box with an arbitrary alignment.
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Anybody can call this to force the label to draw anywhere.
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*/
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void Fl_Widget::draw_label(int X, int Y, int W, int H, Fl_Align a) const {
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if (flags()&SHORTCUT_LABEL) fl_draw_shortcut = 1;
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Fl_Label l1 = label_;
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if (!active_r()) {
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l1.color = fl_inactive((Fl_Color)l1.color);
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if (l1.deimage) l1.image = l1.deimage;
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}
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l1.draw(X,Y,W,H,a);
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fl_draw_shortcut = 0;
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}
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// include these vars here so they can be referenced without including
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// Fl_Input_ code:
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#include <FL/Fl_Input_.H>
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//
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// End of "$Id$".
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//
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