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103 lines
4.2 KiB
103 lines
4.2 KiB
// |
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// Multi-label header file for the Fast Light Tool Kit (FLTK). |
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// |
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// Copyright 1998-2023 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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// https://www.fltk.org/COPYING.php |
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// |
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// Please see the following page on how to report bugs and issues: |
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// |
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// https://www.fltk.org/bugs.php |
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// |
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#ifndef Fl_Multi_Label_H |
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#define Fl_Multi_Label_H |
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class Fl_Widget; |
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struct Fl_Menu_Item; |
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/** Allows a mixed text and/or graphics label to be applied to an Fl_Menu_Item or Fl_Widget. |
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Most regular FLTK widgets now support the ability to associate both images and text |
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with a label but some special cases, notably the non-widget Fl_Menu_Item objects, do not. |
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Fl_Multi_Label may be used to create menu items that have an icon and text, which would |
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not normally be possible for an Fl_Menu_Item. |
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For example, Fl_Multi_Label is used in the New->Code submenu in fluid, and others. |
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\image html Fl_Multi_Label-menu-item.png "Menu items with icons using Fl_Multi_Label" |
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\image latex Fl_Multi_Label-menu-item.png "Menu items with icons using Fl_Multi_Label" width=4cm |
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Each Fl_Multi_Label holds two elements, \p labela and \p labelb; each may hold either a |
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text label (const char*) or an image (Fl_Image*). When displayed, \p labela is drawn first |
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and \p labelb is drawn immediately to its right. |
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More complex labels can be constructed by setting labelb as another Fl_Multi_Label and |
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thus chaining up a series of label elements. |
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When assigning a label element to one of \p labela or \p labelb, they should be |
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explicitly cast to (const char*) if they are not of that type already. |
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\note An Fl_Multi_Label object and all its components (label text, images, chained |
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Fl_Multi_Label's and their linked objects) must exist during the lifetime of the |
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widget or menu item they are assigned to. It is the responsibility of the user's |
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code to release these linked objects if necessary after the widget or menu is deleted. |
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Example Use: Fl_Menu_Bar |
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\code |
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Fl_Pixmap *image = new Fl_Pixmap(..); // image for menu item; any Fl_Image based widget |
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Fl_Menu_Bar *menu = new Fl_Menu_Bar(..); // can be any Fl_Menu_ oriented widget (Fl_Choice, Fl_Menu_Button..) |
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// Create a menu item |
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int i = menu->add("File/New", ..); |
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Fl_Menu_Item *item = (Fl_Menu_Item*)&(menu->menu()[i]); |
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// Create a multi label, assign it an image + text |
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Fl_Multi_Label *ml = new Fl_Multi_Label; |
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// Left side of label is an image |
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ml->typea = FL_IMAGE_LABEL; |
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ml->labela = (const char*)image; // any Fl_Image widget: Fl_Pixmap, Fl_PNG_Image, etc.. |
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// Right side of label is label text |
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ml->typeb = FL_NORMAL_LABEL; |
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ml->labelb = item->label(); |
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// Assign the multilabel to the menu item |
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// ml->label(item); // deprecated since 1.4.0; backwards compatible with 1.3.x |
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item->label(ml); // new method since 1.4.0 |
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\endcode |
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\see Fl_Label and Fl_Labeltype and examples/howto-menu-with-images.cxx |
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*/ |
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struct FL_EXPORT Fl_Multi_Label { |
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/** Holds the "leftmost" of the two elements in the composite label. |
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Typically this would be assigned either a text string (const char*), |
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a (Fl_Image*) or a (Fl_Multi_Label*). */ |
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const char* labela; |
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/** Holds the "rightmost" of the two elements in the composite label. |
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Typically this would be assigned either a text string (const char*), |
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a (Fl_Image*) or a (Fl_Multi_Label*). */ |
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const char* labelb; |
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/** Holds the "type" of labela. |
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Typically this is set to FL_NORMAL_LABEL for a text label, |
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FL_IMAGE_LABEL for an image (based on Fl_image) or FL_MULTI_LABEL |
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if "chaining" multiple Fl_Multi_Label elements together. */ |
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uchar typea; |
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/** Holds the "type" of labelb. |
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Typically this is set to FL_NORMAL_LABEL for a text label, |
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FL_IMAGE_LABEL for an image (based on Fl_image) or FL_MULTI_LABEL |
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if "chaining" multiple Fl_Multi_Label elements together. */ |
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uchar typeb; |
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// This method is used to associate a Fl_Multi_Label with a Fl_Widget. |
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void label(Fl_Widget*); |
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// This method is used to associate a Fl_Multi_Label with a Fl_Menu_Item. |
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void label(Fl_Menu_Item*); |
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}; |
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#endif
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