Android: Widgets can now request the on-screen keyboard when they get…

… focus. This may fail if visible_focus is disabled.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12804 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/Fl_Widget.H

@@ -23,6 +23,7 @@
 #define Fl_Widget_H
 
 #include "Enumerations.H"
+#include "Fl.H"
 
 class Fl_Widget;
 class Fl_Window;
@@ -70,6 +71,7 @@ struct FL_EXPORT Fl_Label {
 };
 
 
+
 /** Fl_Widget is the base class for all widgets in FLTK.  
   
     You can't create one of these because the constructor is not public.
@@ -84,6 +86,7 @@ struct FL_EXPORT Fl_Label {
  */
 class FL_EXPORT Fl_Widget {
   friend class Fl_Group;
+  friend void Fl::focus(Fl_Widget*);
 
   Fl_Group* parent_;
   Fl_Callback* callback_;
@@ -158,6 +161,8 @@ protected:
         FULLSCREEN      = 1<<18,  ///< a fullscreen window (Fl_Window)
         MAC_USE_ACCENTS_MENU = 1<<19, ///< On the Mac OS platform, pressing and holding a key on the keyboard opens an accented-character menu window (Fl_Input_, Fl_Text_Editor)
         // (space for more flags)
+        NEEDS_KEYBOARD  = 1<<20,  ///< set this on touch screen devices if a widget needs a keyboard when it gets Focus. @see Fl_Screen_Driver::request_keyboard()
+        // a tiny bit more space for new flags...
         USERFLAG3       = 1<<29,  ///< reserved for 3rd party extensions
         USERFLAG2       = 1<<30,  ///< reserved for 3rd party extensions
         USERFLAG1       = 1<<31   ///< reserved for 3rd party extensions

src/Fl.cxx

@@ -863,9 +863,18 @@ Fl_Widget* fl_oldfocus; // kludge for Fl_Group...
 
     \see Fl_Widget::take_focus()
 */
-void Fl::focus(Fl_Widget *o) {
-  if (o && !o->visible_focus()) return;
+void Fl::focus(Fl_Widget *o)
+{
   if (grab()) return; // don't do anything while grab is on
+
+  // request an on-screen keyboard on touch screen devices if needed
+  Fl_Widget *prevFocus = Fl::focus();
+  if ( prevFocus && (prevFocus->flags()&Fl_Widget::NEEDS_KEYBOARD) )
+    Fl::screen_driver()->release_keyboard();
+  if (o && (o->flags()&Fl_Widget::NEEDS_KEYBOARD))
+    Fl::screen_driver()->request_keyboard( /*o->type()*/ );
+
+  if (o && !o->visible_focus()) return;
   Fl_Widget *p = focus_;
   if (o != p) {
     Fl::compose_reset();

src/Fl_Input_.cxx

@@ -1128,6 +1128,7 @@ Fl_Input_::Fl_Input_(int X, int Y, int W, int H, const char* l)
   shortcut_ = 0;
   set_flag(SHORTCUT_LABEL);
   set_flag(MAC_USE_ACCENTS_MENU);
+  set_flag(NEEDS_KEYBOARD);
   tab_nav(1);
 }
 

src/Fl_Text_Editor.cxx

@@ -75,6 +75,7 @@ Fl_Text_Editor::Fl_Text_Editor(int X, int Y, int W, int H,  const char* l)
   insert_mode_ = 1;
   key_bindings = 0;
   set_flag(MAC_USE_ACCENTS_MENU);
+  set_flag(NEEDS_KEYBOARD);
 
   // handle the default key bindings
   add_default_key_bindings(&key_bindings);