[ 1508778 ] Fix for wxOwnerDrawnComboBox list selection rendering.

[wxWidgets.git] / src / gtk / scrolbar.cpp

diff --git a/src/gtk/scrolbar.cpp b/src/gtk/scrolbar.cpp
index 13983bb7718c4ff6476b691a0a99978f8273858c..d0a691baea0d1db8e6f8ba43b97b3a178410f270 100644 (file)
--- a/src/gtk/scrolbar.cpp
+++ b/src/gtk/scrolbar.cpp
@@ -32,9 +32,11 @@ gtk_value_changed(GtkRange* range, wxScrollBar* win)
     if (eventType != wxEVT_NULL)
     {
         const int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
+        const int i = orient == wxVERTICAL;
         const int value = win->GetThumbPosition();
         wxScrollEvent event(eventType, win->GetId(), value, orient);
         event.SetEventObject(win);
+        win->m_blockValueChanged[i] = true;
         win->GetEventHandler()->ProcessEvent(event);
         if (!win->m_isScrolling)
         {
@@ -42,6 +44,7 @@ gtk_value_changed(GtkRange* range, wxScrollBar* win)
             event.SetEventObject(win);
             win->GetEventHandler()->ProcessEvent(event);
         }
+        win->m_blockValueChanged[i] = false;
     }
 }
 }
@@ -62,21 +65,17 @@ gtk_button_press_event(GtkRange*, GdkEventButton*, wxScrollBar* win)
 }
 
 //-----------------------------------------------------------------------------
-// "button_release_event" from scrollbar
+// "event_after" from scrollbar
 //-----------------------------------------------------------------------------
 
 extern "C" {
-static gboolean
-gtk_button_release_event(GtkRange*, GdkEventButton*, wxScrollBar* win)
+static void
+gtk_event_after(GtkRange* range, GdkEvent* event, wxScrollBar* win)
 {
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-
-    win->m_mouseButtonDown = false;
-    // If thumb tracking
-    if (win->m_isScrolling)
+    if (event->type == GDK_BUTTON_RELEASE)
     {
-        win->m_isScrolling = false;
+        g_signal_handlers_block_by_func(range, (void*)gtk_event_after, win);
+
         const int value = win->GetThumbPosition();
         const int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
 
@@ -88,6 +87,30 @@ gtk_button_release_event(GtkRange*, GdkEventButton*, wxScrollBar* win)
         event2.SetEventObject(win);
         win->GetEventHandler()->ProcessEvent(event2);
     }
+}
+}
+
+//-----------------------------------------------------------------------------
+// "button_release_event" from scrollbar
+//-----------------------------------------------------------------------------
+
+extern "C" {
+static gboolean
+gtk_button_release_event(GtkRange* range, GdkEventButton*, wxScrollBar* win)
+{
+    if (g_isIdle)
+        wxapp_install_idle_handler();
+
+    win->m_mouseButtonDown = false;
+    // If thumb tracking
+    if (win->m_isScrolling)
+    {
+        win->m_isScrolling = false;
+        // Hook up handler to send thumb release event after this emission is finished.
+        // To allow setting scroll position from event handler, sending event must
+        // be deferred until after the GtkRange handler for this signal has run
+        g_signal_handlers_unblock_by_func(range, (void*)gtk_event_after, win);
+    }
 
     return false;
 }
@@ -136,6 +159,11 @@ bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
     g_signal_connect(m_widget, "button_release_event",
                      G_CALLBACK(gtk_button_release_event), this);
 
+    gulong handler_id;
+    handler_id = g_signal_connect(
+        m_widget, "event_after", G_CALLBACK(gtk_event_after), this);
+    g_signal_handler_block(m_widget, handler_id);
+
     m_parent->DoAddChild( this );
 
     PostCreation(size);
@@ -171,12 +199,21 @@ void wxScrollBar::SetThumbPosition( int viewStart )
 {
     if (GetThumbPosition() != viewStart)
     {
-        BlockScrollEvent();
-        gtk_range_set_value((GtkRange*)m_widget, viewStart);
-        UnblockScrollEvent();
         GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
-        const int i = HasFlag(wxSB_VERTICAL);
-        m_scrollPos[i] = adj->value;
+        const int i = (GtkRange*)m_widget == m_scrollBar[1];
+        const int max = int(adj->upper - adj->page_size);
+        if (viewStart > max)
+            viewStart = max;
+        if (viewStart < 0)
+            viewStart = 0;
+
+        m_scrollPos[i] =
+        adj->value = viewStart;
+        // If a "value_changed" signal emission is not already in progress
+        if (!m_blockValueChanged[i])
+        {
+            gtk_adjustment_value_changed(adj);
+        }
     }
 }
 
@@ -188,16 +225,17 @@ void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageS
         range =
         thumbSize = 1;
     }
+    if (position > range - thumbSize)
+        position = range - thumbSize;
+    if (position < 0)
+        position = 0;
     GtkAdjustment* adj = ((GtkRange*)m_widget)->adjustment;
-    adj->value = position;
     adj->step_increment = 1;
     adj->page_increment = pageSize;
     adj->page_size = thumbSize;
-    BlockScrollEvent();
-    gtk_range_set_range((GtkRange*)m_widget, 0, range);
-    UnblockScrollEvent();
-    const int i = HasFlag(wxSB_VERTICAL);
-    m_scrollPos[i] = adj->value;
+    adj->upper = range;
+    SetThumbPosition(position);
+    gtk_adjustment_changed(adj);
 }
 
 void wxScrollBar::SetPageSize( int pageLength )