Implemented wxDC stack with focus locking and unlocking

Implemented wxClientDC


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22201 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/dc.h

@@ -12,6 +12,9 @@
 #ifndef __WX_COCOA_DC_H__
 #define __WX_COCOA_DC_H__
 
+class WXDLLEXPORT wxDC;
+WX_DECLARE_LIST(wxDC, wxCocoaDCStack);
+
 //=========================================================================
 // wxDC
 //=========================================================================
@@ -19,17 +22,44 @@ class WXDLLEXPORT wxDC: public wxDCBase
 {
     DECLARE_DYNAMIC_CLASS(wxDC)
     DECLARE_NO_COPY_CLASS(wxDC)
+//-------------------------------------------------------------------------
+// Initialization
+//-------------------------------------------------------------------------
 public:
     wxDC();
     ~wxDC();
     
+//-------------------------------------------------------------------------
+// wxCocoa specifics
+//-------------------------------------------------------------------------
+public:
     static void CocoaInitializeTextSystem();
     static void CocoaShutdownTextSystem();
-    static wxDC *sm_focusedDC;
     static WX_NSTextStorage sm_cocoaNSTextStorage;
     static WX_NSLayoutManager sm_cocoaNSLayoutManager;
     static WX_NSTextContainer sm_cocoaNSTextContainer;
-
+protected:
+// DC stack
+    static wxCocoaDCStack sm_cocoaDCStack;
+    virtual bool CocoaLockFocus();
+    virtual bool CocoaUnlockFocus();
+    bool CocoaUnwindStackAndTakeFocus();
+    inline bool CocoaTakeFocus()
+    {
+        wxCocoaDCStack::Node *node = sm_cocoaDCStack.GetFirst();
+        if(node && (node->GetData() == this))
+            return true;
+        return CocoaUnwindStackAndTakeFocus();
+    }
+    void CocoaUnwindStackAndLoseFocus();
+// DC flipping/transformation
+    void CocoaApplyTransformations();
+    float m_cocoaHeight;
+    bool m_cocoaFlipped;
+//-------------------------------------------------------------------------
+// Implementation
+//-------------------------------------------------------------------------
+public:
     // implement base class pure virtuals
     // ----------------------------------
 
@@ -126,7 +156,6 @@ protected:
     virtual void DoDrawPolygon(int n, wxPoint points[],
                                wxCoord xoffset, wxCoord yoffset,
                                int fillStyle = wxODDEVEN_RULE);
-
 };
 
 #endif // __WX_COCOA_DC_H__

include/wx/cocoa/dcclient.h

@@ -41,6 +41,10 @@ public:
     // Create a DC corresponding to a window
     wxClientDC(wxWindow *win);
     ~wxClientDC(void);
+protected:
+// DC stack
+    virtual bool CocoaLockFocus();
+    virtual bool CocoaUnlockFocus();
 };
 
 class wxPaintDC: public wxWindowDC
@@ -51,6 +55,10 @@ public:
     // Create a DC corresponding to a window
     wxPaintDC(wxWindow *win);
     ~wxPaintDC(void);
+protected:
+// DC stack
+    virtual bool CocoaLockFocus();
+    virtual bool CocoaUnlockFocus();
 };
 
 #endif // __WX_COCOA_DCCLIENT_H__

include/wx/cocoa/dcmemory.h

@@ -23,6 +23,9 @@ public:
     ~wxMemoryDC(void);
     virtual void SelectObject(const wxBitmap& bitmap);
     virtual void DoGetSize(int *width, int *height) const;
+// DC stack
+    virtual bool CocoaLockFocus();
+    virtual bool CocoaUnlockFocus();
 };
 
 #endif // __WX_COCOA_DCMEMORY_H__

src/cocoa/dc.mm

@@ -24,11 +24,14 @@
 #import <AppKit/NSTypeSetter.h>
 #import <AppKit/NSImage.h>
 
+#include <wx/listimpl.cpp>
+WX_DEFINE_LIST(wxCocoaDCStack);
+
 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
-wxDC *wxDC::sm_focusedDC = NULL;
 WX_NSTextStorage wxDC::sm_cocoaNSTextStorage = nil;
 WX_NSLayoutManager wxDC::sm_cocoaNSLayoutManager = nil;
 WX_NSTextContainer wxDC::sm_cocoaNSTextContainer = nil;
+wxCocoaDCStack wxDC::sm_cocoaDCStack;
 
 void wxDC::CocoaInitializeTextSystem()
 {
@@ -57,16 +60,93 @@ void wxDC::CocoaShutdownTextSystem()
     [sm_cocoaNSTextStorage release]; sm_cocoaNSTextStorage = nil;
 }
 
+void wxDC::CocoaUnwindStackAndLoseFocus()
+{
+    wxCocoaDCStack::Node *ourNode=sm_cocoaDCStack.Find(this);
+    if(ourNode)
+    {
+        wxCocoaDCStack::Node *node=sm_cocoaDCStack.GetFirst();
+        for(;node!=ourNode; node=sm_cocoaDCStack.GetFirst())
+        {
+            wxDC *dc = node->GetData();
+            wxASSERT(dc);
+            wxASSERT(dc!=this);
+            if(!dc->CocoaUnlockFocus())
+            {
+                wxFAIL_MSG("Unable to unlock focus on higher-level DC!");
+            }
+            sm_cocoaDCStack.DeleteNode(node);
+        }
+        wxASSERT(node==ourNode);
+        wxASSERT(ourNode->GetData() == this);
+        ourNode->GetData()->CocoaUnlockFocus();
+        sm_cocoaDCStack.DeleteNode(ourNode);
+    }
+}
+
+bool wxDC::CocoaUnwindStackAndTakeFocus()
+{
+    wxCocoaDCStack::Node *node=sm_cocoaDCStack.GetFirst();
+    for(;node;node = sm_cocoaDCStack.GetFirst())
+    {
+        wxDC *dc = node->GetData();
+        wxASSERT(dc);
+        // If we're on the stack, then it's unwound enough and we have focus
+        if(dc==this)
+            return true;
+        // If unable to unlockFocus (e.g. wxPaintDC) stop here
+        if(!dc->CocoaUnlockFocus())
+            break;
+        sm_cocoaDCStack.DeleteNode(node);
+    }
+    return CocoaLockFocus();
+}
+
 wxDC::wxDC(void)
 {
+    m_cocoaFlipped = false;
+    m_cocoaHeight = 0.0;
 }
 
 wxDC::~wxDC(void)
 {
 }
 
+bool wxDC::CocoaLockFocus()
+{
+    return false;
+}
+
+bool wxDC::CocoaUnlockFocus()
+{
+    return false;
+}
+
+void wxDC::CocoaApplyTransformations()
+{
+    // This transform flips the graphics since wxDC uses top-left origin
+    if(!m_cocoaFlipped)
+    {
+        // The transform is auto released
+        NSAffineTransform *transform = [NSAffineTransform transform];
+        /*  x' = 1x + 0y + 0
+            y' = 0x + -1y + window's height
+        */
+        NSAffineTransformStruct matrix = {
+            1,  0
+        ,   0, -1
+        ,   0, m_cocoaHeight
+        };
+        [transform setTransformStruct: matrix];
+        // Apply the transform 
+        [transform concat];
+    }
+    // TODO: Apply scaling transformation
+}
+
 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 {
+    if(!CocoaTakeFocus()) return;
     NSBezierPath *bezpath = [NSBezierPath bezierPathWithRect:NSMakeRect(x,y,width,height)];
     [m_textForegroundColour.GetNSColor() set];
     [bezpath stroke];
@@ -76,6 +156,7 @@ void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 
 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
 {
+    if(!CocoaTakeFocus()) return;
     NSBezierPath *bezpath = [NSBezierPath bezierPath];
     [bezpath moveToPoint:NSMakePoint(x1,y1)];
     [bezpath lineToPoint:NSMakePoint(x2,y2)];
@@ -108,6 +189,7 @@ void wxDC::DoGetTextExtent(const wxString& text, wxCoord *x, wxCoord *y, wxCoord
 
 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 {
+    if(!CocoaTakeFocus()) return;
     wxASSERT_MSG(sm_cocoaNSTextStorage && sm_cocoaNSLayoutManager && sm_cocoaNSTextContainer, "Text system has not been initialized.  BAD PROGRAMMER!");
     NSAttributedString *attributedString = [[NSAttributedString alloc]
             initWithString:[NSString stringWithCString:text.c_str()]];
@@ -309,6 +391,7 @@ void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
 
 void wxDC::DoDrawBitmap(const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask)
 {
+    if(!CocoaTakeFocus()) return;
     if(!bmp.Ok())
         return;
 

src/cocoa/dcclient.mm

@@ -11,12 +11,14 @@
 
 #include "wx/dcclient.h"
 #include "wx/window.h"
+#include "wx/log.h"
 
 #import <AppKit/NSView.h>
 #import <AppKit/NSAffineTransform.h>
 #import <AppKit/NSColor.h>
 #import <AppKit/NSGraphicsContext.h>
 #import <AppKit/NSBezierPath.h>
+#import <AppKit/NSWindow.h>
 
 /*
  * wxWindowDC
@@ -67,8 +69,32 @@ wxClientDC::wxClientDC( wxWindow *window )
 
 wxClientDC::~wxClientDC(void)
 {
+    CocoaUnwindStackAndLoseFocus();
 };
 
+bool wxClientDC::CocoaLockFocus()
+{
+    wxLogDebug("Locking focus on wxClientDC=%p, NSView=%p",this, m_window->GetNSView());
+    if([m_window->GetNSView() lockFocusIfCanDraw])
+    {
+        sm_cocoaDCStack.Insert(this);
+        m_cocoaFlipped = [m_window->GetNSView() isFlipped];
+        m_cocoaHeight = [m_window->GetNSView() bounds].size.height;
+        CocoaApplyTransformations();
+        return true;
+    }
+    wxLogDebug("focus lock failed!");
+    return false;
+}
+
+bool wxClientDC::CocoaUnlockFocus()
+{
+    wxLogDebug("Unlocking focus on wxClientDC=%p, NSView=%p",this, m_window->GetNSView());
+    [[m_window->GetNSView() window] flushWindow];
+    [m_window->GetNSView() unlockFocus];
+    return true;
+}
+
 /*
  * wxPaintDC
  */
@@ -82,27 +108,26 @@ wxPaintDC::wxPaintDC( wxWindow *window )
 {
     m_window = window;
     wxASSERT_MSG([NSView focusView]==window->GetNSView(), "PaintDC's NSView does not have focus.  Please use wxPaintDC only as the first DC created in a paint handler");
-    // This transform flips the graphics since wxDC uses top-left origin
-    if(![window->GetNSView() isFlipped])
-    {
-        // The transform is auto released
-        NSAffineTransform *transform = [NSAffineTransform transform];
-        /*  x' = 1x + 0y + 0
-            y' = 0x + -1y + window's height
-        */
-        NSAffineTransformStruct matrix = {
-            1,  0
-        ,   0, -1
-        ,   0, [window->GetNSView() bounds].size.height
-        };
-        [transform setTransformStruct: matrix];
-        // Apply the transform 
-        [transform concat];
-    }
-    // TODO: Apply scaling transformation
+    sm_cocoaDCStack.Insert(this);
+    m_cocoaFlipped = [window->GetNSView() isFlipped];
+    m_cocoaHeight = [window->GetNSView() bounds].size.height;
+    CocoaApplyTransformations();
 };
 
 wxPaintDC::~wxPaintDC(void)
 {
+    CocoaUnwindStackAndLoseFocus();
 };
 
+bool wxPaintDC::CocoaLockFocus()
+{
+    wxFAIL_MSG("wxPaintDC cannot be asked to lock focus!");
+    return false;
+}
+
+bool wxPaintDC::CocoaUnlockFocus()
+{
+    // wxPaintDC focus can never be unlocked.
+    return false;
+}
+

src/cocoa/dcmemory.cpp

@@ -31,6 +31,16 @@ wxMemoryDC::~wxMemoryDC(void)
 {
 }
 
+bool wxMemoryDC::CocoaLockFocus()
+{
+    return false;
+}
+
+bool wxMemoryDC::CocoaUnlockFocus()
+{
+    return false;
+}
+
 void wxMemoryDC::SelectObject( const wxBitmap& bitmap )
 {
 }