STR#2466: Added copy_tooltip().

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7940 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_Tooltip.H

@@ -92,8 +92,10 @@ public:
   // fabien: made it private with only a friend function access
 private:
   friend void Fl_Widget::tooltip(const char *);
+  friend void Fl_Widget::copy_tooltip(const char *);
   static void enter_(Fl_Widget* w);
   static void exit_(Fl_Widget *w);
+  static void set_enter_exit_once_();
 
 private:
   static float delay_; //!< delay before a tooltip is shown

FL/Fl_Widget.H

@@ -162,6 +162,7 @@ protected:
         MODAL           = 1<<14,  ///< a window blocking input to all other winows (Fl_Window)
         NO_OVERLAY      = 1<<15,  ///< window not using a hardware overlay plane (Fl_Menu_Window)
         GROUP_RELATIVE  = 1<<16,  ///< position this idget relative to the parent group, not to the window
+        COPIED_TOOLTIP  = 1<<17,  ///< the widget tooltip is internally copied, its destruction is handled by the widget
         // (space for more flags)
         USERFLAG3       = 1<<29,  ///< reserved for 3rd party extensions
         USERFLAG2       = 1<<30,  ///< reserved for 3rd party extensions
@@ -533,22 +534,12 @@ public:
 
   /** Gets the current tooltip text.
       \return a pointer to the tooltip text or NULL
+      \see tooltip(const char*), copy_tooltip(const char*)
    */
   const char *tooltip() const {return tooltip_;}
 
-  /** Sets the current tooltip text. 
-      Sets a string of text to display in a popup tooltip window when the user 
-      hovers the mouse over the widget. The string is <I>not</I> copied, so 
-      make sure any formatted string is stored in a static, global, 
-      or allocated buffer.
-
-      If no tooltip is set, the tooltip of the parent is inherited. Setting a 
-      tooltip for a group and setting no tooltip for a child will show the 
-      group's tooltip instead. To avoid this behavior, you can set the child's 
-      tooltip to an empty string ("").
-      \param[in] t new tooltip
-   */
-  void tooltip(const char *t);
+  void tooltip(const char *text);		// see Fl_Tooltip
+  void copy_tooltip(const char *text);		// see Fl_Tooltip
 
   /** Gets the current callback function for the widget.
       Each widget has a single callback.

src/Fl_Tooltip.cxx

@@ -30,6 +30,7 @@
 #include <FL/Fl_Menu_Window.H>
 
 #include <stdio.h>
+#include <string.h>	// strdup()
 
 float		Fl_Tooltip::delay_ = 1.0f;
 float		Fl_Tooltip::hoverdelay_ = 0.2f;
@@ -275,14 +276,68 @@ void Fl_Tooltip::enter_area(Fl_Widget* wid, int x,int y,int w,int h, const char*
 #endif // DEBUG
 }
 
-void Fl_Widget::tooltip(const char *tt) {
+void Fl_Tooltip::set_enter_exit_once_() {
   static char beenhere = 0;
   if (!beenhere) {
     beenhere          = 1;
     Fl_Tooltip::enter = Fl_Tooltip::enter_;
     Fl_Tooltip::exit  = Fl_Tooltip::exit_;
   }
-  tooltip_ = tt;
+}
+
+/**
+  Sets the current tooltip text. 
+
+  Sets a string of text to display in a popup tooltip window when the user 
+  hovers the mouse over the widget. The string is <I>not</I> copied, so 
+  make sure any formatted string is stored in a static, global, 
+  or allocated buffer. If you want a copy made and managed for you,
+  use the copy_tooltip() method, which will manage the tooltip string
+  automatically.
+
+  If no tooltip is set, the tooltip of the parent is inherited. Setting a 
+  tooltip for a group and setting no tooltip for a child will show the 
+  group's tooltip instead. To avoid this behavior, you can set the child's 
+  tooltip to an empty string ("").
+  \param[in] text New tooltip text (no copy is made)
+  \see copy_tooltip(const char*), tooltip()
+*/
+void Fl_Widget::tooltip(const char *text) {
+  Fl_Tooltip::set_enter_exit_once_();
+  if (flags() & COPIED_TOOLTIP) {
+    // reassigning a copied tooltip remains the same copied tooltip
+    if (tooltip_ == text) return;
+    free((void*)(tooltip_));            // free maintained copy
+    clear_flag(COPIED_TOOLTIP);         // disable copy flag (WE don't make copies)
+  }
+  tooltip_ = text;
+}
+
+/**
+  Sets the current tooltip text. 
+  Unlike tooltip(), this method allocates a copy of the tooltip 
+  string instead of using the original string pointer.
+
+  The internal copy will automatically be freed whenever you assign
+  a new tooltip or when the widget is destroyed.
+
+  If no tooltip is set, the tooltip of the parent is inherited. Setting a 
+  tooltip for a group and setting no tooltip for a child will show the 
+  group's tooltip instead. To avoid this behavior, you can set the child's 
+  tooltip to an empty string ("").
+  \param[in] text New tooltip text (an internal copy is made and managed)
+  \see tooltip(const char*), tooltip()
+*/
+void Fl_Widget::copy_tooltip(const char *text) {
+  Fl_Tooltip::set_enter_exit_once_();
+  if (flags() & COPIED_TOOLTIP) free((void *)(tooltip_));
+  if (text) {
+    set_flag(COPIED_TOOLTIP);
+    tooltip_ = strdup(text);
+  } else {
+    clear_flag(COPIED_TOOLTIP);
+    tooltip_ = (char *)0;
+  }
 }
 
 //

src/Fl_Widget.cxx

@@ -168,6 +168,7 @@ extern void fl_throw_focus(Fl_Widget*); // in Fl_x.cxx
 Fl_Widget::~Fl_Widget() {
   Fl::clear_widget_pointer(this);
   if (flags() & COPIED_LABEL) free((void *)(label_.value));
+  if (flags() & COPIED_TOOLTIP) free((void *)(tooltip_));
   // remove from parent group
   if (parent_) parent_->remove(this);
 #ifdef DEBUG_DELETE