Added on-demand image loading option to wxRTC.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76110 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/richtext/richtextctrl.h

@@ -55,6 +55,8 @@
 #define wxRICHTEXT_DEFAULT_DELAYED_LAYOUT_THRESHOLD 20000
 // Milliseconds before layout occurs after resize
 #define wxRICHTEXT_DEFAULT_LAYOUT_INTERVAL 50
+// Milliseconds before delayed image processing occurs
+#define wxRICHTEXT_DEFAULT_DELAYED_IMAGE_PROCESSING_INTERVAL 200
 
 /* Identifiers
  */
@@ -2044,6 +2046,38 @@ public:
 
     bool GetImagesEnabled() const;
 
+    /**
+        Enable or disable delayed image loading
+    */
+
+    void EnableDelayedImageLoading(bool b) { m_enableDelayedImageLoading = b; }
+
+    /**
+        Returns @true if delayed image loading is enabled.
+    */
+
+    bool GetDelayedImageLoading() const { return m_enableDelayedImageLoading; }
+
+    /**
+        Gets the flag indicating that delayed image processing is required.
+    */
+    bool GetDelayedImageProcessingRequired() const { return m_delayedImageProcessingRequired; }
+
+    /**
+        Sets the flag indicating that delayed image processing is required.
+    */
+    void SetDelayedImageProcessingRequired(bool b) { m_delayedImageProcessingRequired = b; }
+
+    /**
+        Returns the last time delayed image processing was performed.
+    */
+    wxLongLong GetDelayedImageProcessingTime() const { return m_delayedImageProcessingTime; }
+
+    /**
+        Sets the last time delayed image processing was performed.
+    */
+    void SetDelayedImageProcessingTime(wxLongLong t) { m_delayedImageProcessingTime = t; }
+
     /**
         Returns the caret position since the default formatting was changed. As
         soon as this position changes, we no longer reflect the default style
@@ -2137,6 +2171,22 @@ public:
     // implement wxTextEntry methods
     virtual wxString DoGetValue() const;
 
+    /**
+        Do delayed image loading and garbage-collect other images
+    */
+    bool ProcessDelayedImageLoading(bool refresh);
+    bool ProcessDelayedImageLoading(const wxRect& screenRect, wxRichTextParagraphLayoutBox* box, int& loadCount);
+
+    /**
+        Request delayed image processing.
+    */
+    void RequestDelayedImageProcessing();
+
+    /**
+        Respond to timer events.
+    */
+    void OnTimer(wxTimerEvent& event);
+
 protected:
     // implement the wxTextEntry pure virtual method
     virtual wxWindow *GetEditableWindow();
@@ -2220,6 +2270,23 @@ protected:
 
     /// The object that currently has the editing focus
     wxRichTextParagraphLayoutBox* m_focusObject;
+
+    /// An overall scale factor
+    double                  m_scale;
+
+    /// Variables for scrollbar hysteresis detection
+    wxSize                  m_lastWindowSize;
+    int                     m_setupScrollbarsCount;
+    int                     m_setupScrollbarsCountInOnSize;
+
+    /// Whether images are enabled for this control
+    bool                    m_enableImages;
+
+    /// Whether delayed image loading is enabled for this control
+    bool                    m_enableDelayedImageLoading;
+    bool                    m_delayedImageProcessingRequired;
+    wxLongLong              m_delayedImageProcessingTime;
+    wxTimer                 m_delayedImageProcessingTimer;
 };
 
 /**