Support DPI change in wxStyledTextCtrl

Change to zoom-level and margin width based on the active DPI.
Send wxDPIChangedEvent to all controls and windows.

include/wx/stc/stc.h

@@ -5479,6 +5479,7 @@ protected:
     void OnKeyDown(wxKeyEvent& evt);
     void OnLoseFocus(wxFocusEvent& evt);
     void OnGainFocus(wxFocusEvent& evt);
+    void OnDPIChanged(wxDPIChangedEvent& evt);
     void OnSysColourChanged(wxSysColourChangedEvent& evt);
     void OnEraseBackground(wxEraseEvent& evt);
     void OnMenu(wxCommandEvent& evt);

src/stc/stc.cpp

@@ -159,6 +159,7 @@ wxBEGIN_EVENT_TABLE(wxStyledTextCtrl, wxControl)
     EVT_KEY_DOWN                (wxStyledTextCtrl::OnKeyDown)
     EVT_KILL_FOCUS              (wxStyledTextCtrl::OnLoseFocus)
     EVT_SET_FOCUS               (wxStyledTextCtrl::OnGainFocus)
+    EVT_DPI_CHANGED             (wxStyledTextCtrl::OnDPIChanged)
     EVT_SYS_COLOUR_CHANGED      (wxStyledTextCtrl::OnSysColourChanged)
     EVT_ERASE_BACKGROUND        (wxStyledTextCtrl::OnEraseBackground)
     EVT_MENU_RANGE              (10, 16, wxStyledTextCtrl::OnMenu)
@@ -239,6 +240,16 @@ bool wxStyledTextCtrl::Create(wxWindow *parent,
     SetFontQuality(wxSTC_EFF_QUALITY_DEFAULT);
 #endif
 
+#ifdef __WXMSW__
+    // Set zoom for DPI
+    double baseDPI = ::GetDeviceCaps(WindowHDC(parent->GetHWND()), LOGPIXELSY);
+    double activeDPI = parent->GetDPI().y;
+
+    int ptSizeOld = StyleGetSize(wxSTC_STYLE_DEFAULT);
+    int ptSizeNew = (int)wxMulDivInt32(ptSizeOld, activeDPI, baseDPI);
+    SetZoom(GetZoom() + (ptSizeNew - ptSizeOld));
+#endif
+
     return true;
 }
 
@@ -5432,6 +5443,19 @@ void wxStyledTextCtrl::OnGainFocus(wxFocusEvent& evt) {
 }
 
 
+void wxStyledTextCtrl::OnDPIChanged(wxDPIChangedEvent& evt)
+{
+    int ptSizeOld = StyleGetSize(wxSTC_STYLE_DEFAULT);
+    int ptSizeNew = (int)wxMulDivInt32(ptSizeOld, evt.GetNewDPI().y, evt.GetOldDPI().y);
+    SetZoom(GetZoom() + (ptSizeNew - ptSizeOld));
+
+    for ( int i = 0; i < SC_MAX_MARGIN; ++i )
+    {
+        SetMarginWidth(i, (int)wxMulDivInt32(GetMarginWidth(i), evt.GetNewDPI().y, evt.GetOldDPI().y));
+    }
+}
+
+
 void wxStyledTextCtrl::OnSysColourChanged(wxSysColourChangedEvent& WXUNUSED(evt)) {
     m_swx->DoSysColourChange();
 }
@@ -5467,7 +5491,7 @@ wxSize wxStyledTextCtrl::DoGetBestSize() const
 {
     // What would be the best size for a wxSTC?
     // Just give a reasonable minimum until something else can be figured out.
-    return wxSize(200,100);
+    return FromDIP(wxSize(200,100));
 }
 
 

src/stc/stc.cpp.in

@@ -159,6 +159,7 @@ wxBEGIN_EVENT_TABLE(wxStyledTextCtrl, wxControl)
     EVT_KEY_DOWN                (wxStyledTextCtrl::OnKeyDown)
     EVT_KILL_FOCUS              (wxStyledTextCtrl::OnLoseFocus)
     EVT_SET_FOCUS               (wxStyledTextCtrl::OnGainFocus)
+    EVT_DPI_CHANGED             (wxStyledTextCtrl::OnDPIChanged)
     EVT_SYS_COLOUR_CHANGED      (wxStyledTextCtrl::OnSysColourChanged)
     EVT_ERASE_BACKGROUND        (wxStyledTextCtrl::OnEraseBackground)
     EVT_MENU_RANGE              (10, 16, wxStyledTextCtrl::OnMenu)
@@ -239,6 +240,16 @@ bool wxStyledTextCtrl::Create(wxWindow *parent,
     SetFontQuality(wxSTC_EFF_QUALITY_DEFAULT);
 #endif
 
+#ifdef __WXMSW__
+    // Set zoom for DPI
+    double baseDPI = ::GetDeviceCaps(WindowHDC(parent->GetHWND()), LOGPIXELSY);
+    double activeDPI = parent->GetDPI().y;
+
+    int ptSizeOld = StyleGetSize(wxSTC_STYLE_DEFAULT);
+    int ptSizeNew = (int)wxMulDivInt32(ptSizeOld, activeDPI, baseDPI);
+    SetZoom(GetZoom() + (ptSizeNew - ptSizeOld));
+#endif
+
     return true;
 }
 
@@ -959,6 +970,19 @@ void wxStyledTextCtrl::OnGainFocus(wxFocusEvent& evt) {
 }
 
 
+void wxStyledTextCtrl::OnDPIChanged(wxDPIChangedEvent& evt)
+{
+    int ptSizeOld = StyleGetSize(wxSTC_STYLE_DEFAULT);
+    int ptSizeNew = (int)wxMulDivInt32(ptSizeOld, evt.GetNewDPI().y, evt.GetOldDPI().y);
+    SetZoom(GetZoom() + (ptSizeNew - ptSizeOld));
+
+    for ( int i = 0; i < SC_MAX_MARGIN; ++i )
+    {
+        SetMarginWidth(i, (int)wxMulDivInt32(GetMarginWidth(i), evt.GetNewDPI().y, evt.GetOldDPI().y));
+    }
+}
+
+
 void wxStyledTextCtrl::OnSysColourChanged(wxSysColourChangedEvent& WXUNUSED(evt)) {
     m_swx->DoSysColourChange();
 }
@@ -994,7 +1018,7 @@ wxSize wxStyledTextCtrl::DoGetBestSize() const
 {
     // What would be the best size for a wxSTC?
     // Just give a reasonable minimum until something else can be figured out.
-    return wxSize(200,100);
+    return FromDIP(wxSize(200,100));
 }
 
 

src/stc/stc.h.in

@@ -597,6 +597,7 @@ protected:
     void OnKeyDown(wxKeyEvent& evt);
     void OnLoseFocus(wxFocusEvent& evt);
     void OnGainFocus(wxFocusEvent& evt);
+    void OnDPIChanged(wxDPIChangedEvent& evt);
     void OnSysColourChanged(wxSysColourChangedEvent& evt);
     void OnEraseBackground(wxEraseEvent& evt);
     void OnMenu(wxCommandEvent& evt);