#887: Fixes FLTK file chooser not releasing preview image.

...when hidden

FL/Fl_File_Chooser.H

@@ -1,7 +1,7 @@
 //
 // Fl_File_Chooser dialog for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2021 by Bill Spitzak and others.
+// Copyright 1998-2024 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -145,7 +145,6 @@ public:
   const char * filter();
   int filter_value();
   void filter_value(int f);
-  void hide();
   void iconsize(uchar s);
   uchar iconsize();
   void label(const char *l);
@@ -161,6 +160,7 @@ public:
   void rescan();
   void rescan_keep_filename();
   void show();
+  void hide();
   int shown();
   void textcolor(Fl_Color c);
   Fl_Color textcolor();

src/Fl_File_Chooser.cxx

@@ -1,7 +1,7 @@
 //
 // Fl_File_Chooser dialog for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2021 by Bill Spitzak and others.
+// Copyright 1998-2024 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -29,8 +29,7 @@
 void Fl_File_Chooser::cb_window_i(Fl_Double_Window*, void*) {
   fileName->value("");
   fileList->deselect();
-  Fl::remove_timeout((Fl_Timeout_Handler)previewCB, this);
-  window->hide();
+  hide();
 }
 void Fl_File_Chooser::cb_window(Fl_Double_Window* o, void* v) {
   ((Fl_File_Chooser*)(o->user_data()))->cb_window_i(o,v);
@@ -105,7 +104,7 @@ void Fl_File_Chooser::cb_fileName(Fl_File_Input* o, void* v) {
 }
 
 void Fl_File_Chooser::cb_okButton_i(Fl_Return_Button*, void*) {
-  window->hide();
+  hide();
 
   // Do any callback that is registered...
   if (callback_)
@@ -118,8 +117,7 @@ void Fl_File_Chooser::cb_okButton(Fl_Return_Button* o, void* v) {
 void Fl_File_Chooser::cb_cancelButton_i(Fl_Button*, void*) {
   fileName->value("");
   fileList->deselect();
-  Fl::remove_timeout((Fl_Timeout_Handler)previewCB, this);
-  window->hide();
+  hide();
 }
 void Fl_File_Chooser::cb_cancelButton(Fl_Button* o, void* v) {
   ((Fl_File_Chooser*)(o->parent()->parent()->parent()->user_data()))->cb_cancelButton_i(o,v);
@@ -222,19 +220,19 @@ Fl_File_Chooser::Fl_File_Chooser(const char *pathname, const char *pattern, int
     } // Fl_Tile* o
     { Fl_Group* o = new Fl_Group(10, 275, 470, 95);
       { Fl_Group* o = new Fl_Group(10, 275, 470, 20);
-        { previewButton = new Fl_Check_Button(10, 275, 73, 20, "Preview");
+        { previewButton = new Fl_Check_Button(10, 275, 105, 20, "Preview");
           previewButton->shortcut(0x80070);
           previewButton->down_box(FL_DOWN_BOX);
           previewButton->value(1);
           previewButton->callback((Fl_Callback*)cb_previewButton);
           previewButton->label(preview_label);
         } // Fl_Check_Button* previewButton
-        { showHiddenButton = new Fl_Check_Button(115, 275, 165, 20, "Show hidden files");
+        { showHiddenButton = new Fl_Check_Button(115, 275, 140, 20, "Show hidden files");
           showHiddenButton->down_box(FL_DOWN_BOX);
           showHiddenButton->callback((Fl_Callback*)cb_showHiddenButton);
           showHiddenButton->label(hidden_label);
         } // Fl_Check_Button* showHiddenButton
-        { Fl_Box* o = new Fl_Box(115, 275, 365, 20);
+        { Fl_Box* o = new Fl_Box(255, 275, 225, 20);
           Fl_Group::current()->resizable(o);
         } // Fl_Box* o
         o->end();
@@ -364,10 +362,6 @@ void Fl_File_Chooser::filter_value(int f) {
   showChoiceCB();
 }
 
-void Fl_File_Chooser::hide() {
-  window->hide();
-}
-
 void Fl_File_Chooser::iconsize(uchar s) {
   fileList->iconsize(s);
 }

src/Fl_File_Chooser.fl

@@ -5,7 +5,7 @@ code_name {.cxx}
 comment {//
 // Fl_File_Chooser dialog for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2021 by Bill Spitzak and others.
+// Copyright 1998-2024 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -76,7 +76,7 @@ Determines the type of file chooser presented to the user.
   }
   decl {void update_preview();} {private local
   }
-  Function {Fl_File_Chooser(const char *pathname, const char *pattern, int type_val, const char *title)} {open selected
+  Function {Fl_File_Chooser(const char *pathname, const char *pattern, int type_val, const char *title)} {open
   } {
     code {if (!prefs_) {
   prefs_ = new Fl_Preferences(Fl_Preferences::CORE_USER, "fltk.org", "filechooser");
@@ -86,10 +86,9 @@ Determines the type of file chooser presented to the user.
       label {Choose File}
       callback {fileName->value("");
 fileList->deselect();
-Fl::remove_timeout((Fl_Timeout_Handler)previewCB, this);
-window->hide();} open
-      private xywh {0 0 490 380} type Double hide resizable
-      code0 {if (title) window->label(title);} modal
+hide();} open selected
+      private xywh {467 276 490 380} type Double resizable
+      code0 {if (title) window->label(title);} modal visible
     } {
       Fl_Group {} {open
         private xywh {10 10 470 25}
@@ -140,17 +139,17 @@ window->hide();} open
           Fl_Check_Button previewButton {
             label Preview
             callback {preview(previewButton->value());}
-            xywh {10 275 73 20} down_box DOWN_BOX shortcut 0x80070 value 1
+            xywh {10 275 105 20} down_box DOWN_BOX shortcut 0x80070 value 1
             code0 {previewButton->label(preview_label);}
           }
           Fl_Check_Button showHiddenButton {
             label {Show hidden files}
             callback {showHidden(showHiddenButton->value());}
-            xywh {115 275 165 20} down_box DOWN_BOX
+            xywh {115 275 140 20} down_box DOWN_BOX
             code0 {showHiddenButton->label(hidden_label);}
           }
           Fl_Box {} {
-            private xywh {115 275 365 20} resizable
+            private xywh {255 275 225 20} resizable
           }
         }
         Fl_File_Input fileName {
@@ -168,7 +167,7 @@ window->hide();} open
         } {
           Fl_Return_Button okButton {
             label OK
-            callback {window->hide();
+            callback {hide();
 
 // Do any callback that is registered...
 if (callback_)
@@ -181,8 +180,7 @@ if (callback_)
             label Cancel
             callback {fileName->value("");
 fileList->deselect();
-Fl::remove_timeout((Fl_Timeout_Handler)previewCB, this);
-window->hide();}
+hide();}
             private xywh {408 345 72 25}
             code0 {o->label(fl_cancel);}
           }
@@ -298,10 +296,6 @@ data_     = d;} {}
     code {showChoice->value(f);
 showChoiceCB();} {}
   }
-  Function {hide()} {return_type void
-  } {
-    code {window->hide();} {}
-  }
   Function {iconsize(uchar s)} {return_type void
   } {
     code {fileList->iconsize(s);} {}
@@ -345,6 +339,8 @@ okButton->parent()->init_sizes();} {}
   }
   decl {void show();} {public local
   }
+  decl {void hide();} {public local
+  }
   Function {shown()} {return_type int
   } {
     code {return window->shown();} {}

src/Fl_File_Chooser2.cxx

@@ -1551,6 +1551,14 @@ void Fl_File_Chooser::show()
   if (!Fl::system_driver()->dot_file_hidden()) showHiddenButton->hide();
 }
 
+void Fl_File_Chooser::hide() {
+  Fl::remove_timeout((Fl_Timeout_Handler)previewCB, this);
+  Fl_Shared_Image *oldimage = (Fl_Shared_Image*)previewBox->image();
+  if (oldimage) oldimage->release();
+  previewBox->image(NULL);
+  window->hide();
+}
+
 void Fl_File_Chooser::showHidden(int value)
 {
   if (value) {