/// <summary>
/// Creates a new clipping region from the intersection of the current clipping region and
/// the specified rectangle.
/// </summary>
public void IntersectClip(WindowsRegion wr)
{
//if the incoming windowsregion is infinite, there is no need to do any intersecting.
if (wr.HRegion == IntPtr.Zero)
{
return;
}
WindowsRegion clip = new WindowsRegion(0, 0, 0, 0);
try
{
int result = Gdi32.GetClipRgn(new HandleRef(this, Hdc), new HandleRef(clip, clip.HRegion));
// If the function succeeds and there is a clipping region for the given device context, the return value is 1.
if (result == 1)
{
Debug.Assert(clip.HRegion != IntPtr.Zero);
wr.CombineRegion(clip, wr, Gdi32.CombineMode.RGN_AND);
}
SetClip(wr);
}
finally
{
clip.Dispose();
}
}
/// <summary>
/// Selects a region as the current clipping region for the device context.
/// Remarks (From MSDN):
/// - Only a copy of the selected region is used. The region itself can be selected for any number of other device contexts or it can be deleted.
/// - The SelectClipRgn function assumes that the coordinates for a region are specified in device units.
/// - To remove a device-context's clipping region, specify a NULL region handle.
/// </summary>
public void SetClip(WindowsRegion region)
{
HandleRef hdc = new HandleRef(this, Hdc);
HandleRef hRegion = new HandleRef(region, region.HRegion);
IntUnsafeNativeMethods.SelectClipRgn(hdc, hRegion);
}
/// <summary>
/// Selects a region as the current clipping region for the device context.
/// Remarks (From MSDN):
/// - Only a copy of the selected region is used. The region itself can be selected for any number of other device contexts or it can be deleted.
/// - The SelectClipRgn function assumes that the coordinates for a region are specified in device units.
/// - To remove a device-context's clipping region, specify a NULL region handle.
/// </summary>
public void SetClip(WindowsRegion region)
{
HandleRef hdc = new HandleRef(this, Hdc);
HandleRef hRegion = new HandleRef(region, region.HRegion);
Gdi32.SelectClipRgn(hdc, hRegion);
}
public static WindowsRegion FromHregion(IntPtr hRegion, bool takeOwnership)
{
WindowsRegion region = new WindowsRegion();
if (hRegion != IntPtr.Zero)
{
region.nativeHandle = hRegion;
if (takeOwnership)
{
region.ownHandle = true;
System.Internal.HandleCollector.Add(hRegion, IntSafeNativeMethods.CommonHandles.GDI);
}
}
return region;
}
public void IntersectClip(WindowsRegion wr)
{
if (wr.HRegion != IntPtr.Zero)
{
using (WindowsRegion region = new WindowsRegion(0, 0, 0, 0))
{
if (IntUnsafeNativeMethods.GetClipRgn(new HandleRef(this, this.Hdc), new HandleRef(region, region.HRegion)) == 1)
{
wr.CombineRegion(region, wr, RegionCombineMode.AND);
}
this.SetClip(wr);
}
}
}
public static WindowsGraphics FromGraphics(Graphics g, ApplyGraphicsProperties properties)
{
WindowsRegion wr = null;
float[] elements = null;
Region region = null;
Matrix matrix = null;
if (((properties & ApplyGraphicsProperties.TranslateTransform) != ApplyGraphicsProperties.None) || ((properties & ApplyGraphicsProperties.Clipping) != ApplyGraphicsProperties.None))
{
object[] contextInfo = g.GetContextInfo() as object[];
if ((contextInfo != null) && (contextInfo.Length == 2))
{
region = contextInfo[0] as Region;
matrix = contextInfo[1] as Matrix;
}
if (matrix != null)
{
if ((properties & ApplyGraphicsProperties.TranslateTransform) != ApplyGraphicsProperties.None)
{
elements = matrix.Elements;
}
matrix.Dispose();
}
if (region != null)
{
if (((properties & ApplyGraphicsProperties.Clipping) != ApplyGraphicsProperties.None) && !region.IsInfinite(g))
{
wr = WindowsRegion.FromRegion(region, g);
}
region.Dispose();
}
}
WindowsGraphics graphics = FromHdc(g.GetHdc());
graphics.graphics = g;
if (wr != null)
{
using (wr)
{
graphics.DeviceContext.IntersectClip(wr);
}
}
if (elements != null)
{
graphics.DeviceContext.TranslateTransform((int)elements[4], (int)elements[5]);
}
return(graphics);
}
public static WindowsRegion FromHregion(IntPtr hRegion, bool takeOwnership)
{
WindowsRegion region = new WindowsRegion();
if (hRegion != IntPtr.Zero)
{
region.nativeHandle = hRegion;
if (takeOwnership)
{
region.ownHandle = true;
System.Internal.HandleCollector.Add(hRegion, IntSafeNativeMethods.CommonHandles.GDI);
}
}
return(region);
}
// Consider implementing a constructor that calls ExtCreateRegion(XFORM lpXform, DWORD nCount, RGNDATA lpRgnData) if needed.
/// <summary>
/// Creates a WindowsRegion from a region handle, if 'takeOwnership' is true, the handle is added to the HandleCollector
/// and is removed & destroyed on dispose.
/// </summary>
public static WindowsRegion FromHregion(IntPtr hRegion, bool takeOwnership)
{
WindowsRegion wr = new WindowsRegion();
// Note: Passing IntPtr.Zero for hRegion is ok. GDI+ infinite regions will have hRegion == null.
// GDI's SelectClipRgn interprets null region handle as resetting the clip region (all region will be available for painting).
if (hRegion != IntPtr.Zero)
{
wr.nativeHandle = hRegion;
if (takeOwnership)
{
wr.ownHandle = true;
}
}
return(wr);
}
/// <summary>
/// Creates a WindowsRegion from a System.Drawing.Region.
/// </summary>
public static WindowsRegion FromRegion(Region region, Graphics g)
{
if (region.IsInfinite(g))
{
// An infinite region would cover the entire device region which is the same as
// not having a clipping region. Observe that this is not the same as having an
// empty region, which when clipping to it has the effect of excluding the entire
// device region.
// To remove the clip region from a dc the SelectClipRgn() function needs to be
// called with a null region ptr - that's why we use the empty constructor here.
// GDI+ will return IntPtr.Zero for Region.GetHrgn(Graphics) when the region is
// Infinite.
return(new WindowsRegion());
}
return(WindowsRegion.FromHregion(region.GetHrgn(g), true));
}
public static WindowsGraphics FromGraphics(Graphics g, ApplyGraphicsProperties properties)
{
WindowsRegion wr = null;
float[] elements = null;
Region clipRgn = null;
Matrix worldTransf = null;
if ((properties & ApplyGraphicsProperties.TranslateTransform) != 0 || (properties & ApplyGraphicsProperties.Clipping) != 0)
{
if (g.GetContextInfo() is object[] data && data.Length == 2)
{
clipRgn = data[0] as Region;
worldTransf = data[1] as Matrix;
}
if (worldTransf != null)
{
if ((properties & ApplyGraphicsProperties.TranslateTransform) != 0)
{
elements = worldTransf.Elements;
}
worldTransf.Dispose();
}
if (clipRgn != null)
{
if ((properties & ApplyGraphicsProperties.Clipping) != 0)
{
// We have to create the WindowsRegion and dipose the Region object before locking the Graphics object,
// in case of an unlikely exception before releasing the WindowsRegion, the finalizer will do it for us.
// (no try-finally block since this method is used frequently - perf).
// If the Graphics.Clip has not been set (Region.IsInfinite) we don't need to apply it to the DC.
if (!clipRgn.IsInfinite(g))
{
wr = WindowsRegion.FromRegion(clipRgn, g); // WindowsRegion will take ownership of the hRegion.
}
}
clipRgn.Dispose(); // Disposing the Region object doesn't destroy the hRegion.
}
}
WindowsGraphics wg = FromHdc(g.GetHdc()); // This locks the Graphics object.
wg._graphics = g;
// Apply transform and clip
if (wr != null)
{
using (wr)
{
// If the Graphics object was created from a native DC the actual clipping region is the intersection
// beteween the original DC clip region and the GDI+ one - for display Graphics it is the same as
// Graphics.VisibleClipBounds.
wg.DeviceContext.IntersectClip(wr);
}
}
if (elements != null)
{
// elements (XFORM) = [eM11, eM12, eM21, eM22, eDx, eDy], eDx/eDy specify the translation offset.
wg.DeviceContext.TranslateTransform((int)elements[4], (int)elements[5]);
}
return(wg);
}
protected override void WndProc(ref Message m) {
switch (m.Msg) {
// We don't want to fire the focus events twice -
// once in the combobox and once in the ChildWndProc.
case NativeMethods.WM_SETFOCUS:
try {
fireSetFocus = false;
base.WndProc(ref m);
}
finally {
fireSetFocus = true;
}
break;
case NativeMethods.WM_KILLFOCUS:
try {
fireLostFocus = false;
base.WndProc(ref m);
// Nothing to see here... Just keep on walking... VSWhidbey 504477.
// Turns out that with Theming off, we don't get quite the same messages as with theming on.
// With theming on we get a WM_MOUSELEAVE after a WM_KILLFOCUS even if you use the Tab key
// to move focus. Our response to WM_MOUSELEAVE causes us to repaint everything correctly.
// With theming off, we do not get a WM_MOUSELEAVE after a WM_KILLFOCUS, and since we don't have a childwndproc
// when we are a Flat DropDownList, we need to force a repaint. The easiest way to do this is to send a
// WM_MOUSELEAVE to ourselves, since that also sets up the right state. Or... at least the state is the same
// as with Theming on.
// This is such a @#$(*&#@$ hack.
if (!Application.RenderWithVisualStyles && GetStyle(ControlStyles.UserPaint) == false && this.DropDownStyle == ComboBoxStyle.DropDownList && (FlatStyle == FlatStyle.Flat || FlatStyle == FlatStyle.Popup)) {
UnsafeNativeMethods.PostMessage(new HandleRef(this, Handle), NativeMethods.WM_MOUSELEAVE, 0, 0);
}
}
finally {
fireLostFocus = true;
}
break;
case NativeMethods.WM_CTLCOLOREDIT:
case NativeMethods.WM_CTLCOLORLISTBOX:
m.Result = InitializeDCForWmCtlColor(m.WParam, m.Msg);
break;
case NativeMethods.WM_ERASEBKGND:
WmEraseBkgnd(ref m);
break;
case NativeMethods.WM_PARENTNOTIFY:
WmParentNotify(ref m);
break;
case NativeMethods.WM_REFLECT + NativeMethods.WM_COMMAND:
WmReflectCommand(ref m);
break;
case NativeMethods.WM_REFLECT + NativeMethods.WM_DRAWITEM:
WmReflectDrawItem(ref m);
break;
case NativeMethods.WM_REFLECT + NativeMethods.WM_MEASUREITEM:
WmReflectMeasureItem(ref m);
break;
case NativeMethods.WM_LBUTTONDOWN:
mouseEvents = true;
base.WndProc(ref m);
break;
case NativeMethods.WM_LBUTTONUP:
// Get the mouse location
//
NativeMethods.RECT r = new NativeMethods.RECT();
UnsafeNativeMethods.GetWindowRect(new HandleRef(this, Handle), ref r);
Rectangle ClientRect = new Rectangle(r.left, r.top, r.right - r.left, r.bottom - r.top);
int x = NativeMethods.Util.SignedLOWORD(m.LParam);
int y = NativeMethods.Util.SignedHIWORD(m.LParam);
Point pt = new Point(x, y);
pt = PointToScreen(pt);
//mouseEvents is used to keep the check that we get the WM_LBUTTONUP after
//WM_LBUTTONDOWN or WM_LBUTTONDBLBCLK
// combo box gets a WM_LBUTTONUP for focus change ...
//
if (mouseEvents && !ValidationCancelled) {
mouseEvents = false;
bool captured = Capture;
if (captured && ClientRect.Contains(pt)) {
OnClick(new MouseEventArgs(MouseButtons.Left, 1, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));
OnMouseClick(new MouseEventArgs(MouseButtons.Left, 1, NativeMethods.Util.SignedLOWORD(m.LParam), NativeMethods.Util.SignedHIWORD(m.LParam), 0));
}
base.WndProc(ref m);
}
else {
CaptureInternal = false;
DefWndProc(ref m);
}
break;
case NativeMethods.WM_MOUSELEAVE:
DefWndProc(ref m);
OnMouseLeaveInternal(EventArgs.Empty);
break;
case NativeMethods.WM_PAINT:
if (GetStyle(ControlStyles.UserPaint) == false && (FlatStyle == FlatStyle.Flat || FlatStyle == FlatStyle.Popup)) {
using (WindowsRegion dr = new WindowsRegion(FlatComboBoxAdapter.dropDownRect)) {
using (WindowsRegion wr = new WindowsRegion(this.Bounds)) {
// Stash off the region we have to update (the base is going to clear this off in BeginPaint)
NativeMethods.RegionFlags updateRegionFlags = (NativeMethods.RegionFlags)SafeNativeMethods.GetUpdateRgn(new HandleRef(this, this.Handle), new HandleRef(this, wr.HRegion), true);
dr.CombineRegion(wr, dr, RegionCombineMode.DIFF);
Rectangle updateRegionBoundingRect = wr.ToRectangle();
FlatComboBoxAdapter.ValidateOwnerDrawRegions(this, updateRegionBoundingRect);
// Call the base class to do its painting (with a clipped DC).
NativeMethods.PAINTSTRUCT ps = new NativeMethods.PAINTSTRUCT();
IntPtr dc;
bool disposeDc = false;
if (m.WParam == IntPtr.Zero) {
dc = UnsafeNativeMethods.BeginPaint(new HandleRef(this, Handle), ref ps);
disposeDc = true;
}
else {
dc = m.WParam;
}
using (DeviceContext mDC = DeviceContext.FromHdc(dc)) {
using (WindowsGraphics wg = new WindowsGraphics(mDC)) {
if (updateRegionFlags != NativeMethods.RegionFlags.ERROR) {
wg.DeviceContext.SetClip(dr);
}
m.WParam = dc;
DefWndProc(ref m);
if (updateRegionFlags != NativeMethods.RegionFlags.ERROR) {
wg.DeviceContext.SetClip(wr);
}
using (Graphics g = Graphics.FromHdcInternal(dc)) {
FlatComboBoxAdapter.DrawFlatCombo(this, g);
}
}
}
if (disposeDc) {
UnsafeNativeMethods.EndPaint(new HandleRef(this, Handle), ref ps);
}
}
return;
}
}
base.WndProc(ref m);
break;
case NativeMethods.WM_PRINTCLIENT:
// all the fancy stuff we do in OnPaint has to happen again in OnPrint.
if (GetStyle(ControlStyles.UserPaint) == false && FlatStyle == FlatStyle.Flat || FlatStyle == FlatStyle.Popup) {
DefWndProc(ref m);
if ((unchecked( (int) (long)m.LParam) & NativeMethods.PRF_CLIENT) == NativeMethods.PRF_CLIENT) {
if (GetStyle(ControlStyles.UserPaint) == false && FlatStyle == FlatStyle.Flat || FlatStyle == FlatStyle.Popup) {
using (Graphics g = Graphics.FromHdcInternal(m.WParam)) {
FlatComboBoxAdapter.DrawFlatCombo(this,g);
}
}
return;
}
}
base.WndProc(ref m);
return;
case NativeMethods.WM_SETCURSOR:
base.WndProc(ref m);
break;
case NativeMethods.WM_SETFONT:
//(bug 119265)
if (Width == 0) {
suppressNextWindosPos = true;
}
base.WndProc(ref m);
break;
case NativeMethods.WM_WINDOWPOSCHANGED:
if (!suppressNextWindosPos) {
base.WndProc(ref m);
}
suppressNextWindosPos = false;
break;
case NativeMethods.WM_NCDESTROY:
base.WndProc(ref m);
ReleaseChildWindow();
break;
default:
if (m.Msg == NativeMethods.WM_MOUSEENTER) {
DefWndProc(ref m);
OnMouseEnterInternal(EventArgs.Empty);
break;
}
base.WndProc(ref m);
break;
}
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case 7:
try
{
this.fireSetFocus = false;
base.WndProc(ref m);
return;
}
finally
{
this.fireSetFocus = true;
}
break;
case 8:
break;
case 15:
if (!base.GetStyle(ControlStyles.UserPaint) && ((this.FlatStyle == System.Windows.Forms.FlatStyle.Flat) || (this.FlatStyle == System.Windows.Forms.FlatStyle.Popup)))
{
using (WindowsRegion region = new WindowsRegion(this.FlatComboBoxAdapter.dropDownRect))
{
using (WindowsRegion region2 = new WindowsRegion(base.Bounds))
{
IntPtr wParam;
System.Windows.Forms.NativeMethods.RegionFlags flags = (System.Windows.Forms.NativeMethods.RegionFlags) System.Windows.Forms.SafeNativeMethods.GetUpdateRgn(new HandleRef(this, base.Handle), new HandleRef(this, region2.HRegion), true);
region.CombineRegion(region2, region, RegionCombineMode.DIFF);
Rectangle updateRegionBox = region2.ToRectangle();
this.FlatComboBoxAdapter.ValidateOwnerDrawRegions(this, updateRegionBox);
System.Windows.Forms.NativeMethods.PAINTSTRUCT lpPaint = new System.Windows.Forms.NativeMethods.PAINTSTRUCT();
bool flag2 = false;
if (m.WParam == IntPtr.Zero)
{
wParam = System.Windows.Forms.UnsafeNativeMethods.BeginPaint(new HandleRef(this, base.Handle), ref lpPaint);
flag2 = true;
}
else
{
wParam = m.WParam;
}
using (DeviceContext context = DeviceContext.FromHdc(wParam))
{
using (WindowsGraphics graphics = new WindowsGraphics(context))
{
if (flags != System.Windows.Forms.NativeMethods.RegionFlags.ERROR)
{
graphics.DeviceContext.SetClip(region);
}
m.WParam = wParam;
this.DefWndProc(ref m);
if (flags != System.Windows.Forms.NativeMethods.RegionFlags.ERROR)
{
graphics.DeviceContext.SetClip(region2);
}
using (Graphics graphics2 = Graphics.FromHdcInternal(wParam))
{
this.FlatComboBoxAdapter.DrawFlatCombo(this, graphics2);
}
}
}
if (flag2)
{
System.Windows.Forms.UnsafeNativeMethods.EndPaint(new HandleRef(this, base.Handle), ref lpPaint);
}
}
return;
}
}
base.WndProc(ref m);
return;
case 20:
this.WmEraseBkgnd(ref m);
return;
case 0x47:
if (!this.suppressNextWindosPos)
{
base.WndProc(ref m);
}
this.suppressNextWindosPos = false;
return;
case 130:
base.WndProc(ref m);
this.ReleaseChildWindow();
return;
case 0x20:
base.WndProc(ref m);
return;
case 0x30:
if (base.Width == 0)
{
this.suppressNextWindosPos = true;
}
base.WndProc(ref m);
return;
case 0x133:
case 0x134:
goto Label_017F;
case 0x201:
this.mouseEvents = true;
base.WndProc(ref m);
return;
case 0x202:
{
System.Windows.Forms.NativeMethods.RECT rect = new System.Windows.Forms.NativeMethods.RECT();
System.Windows.Forms.UnsafeNativeMethods.GetWindowRect(new HandleRef(this, base.Handle), ref rect);
Rectangle rectangle = new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
int x = System.Windows.Forms.NativeMethods.Util.SignedLOWORD(m.LParam);
int y = System.Windows.Forms.NativeMethods.Util.SignedHIWORD(m.LParam);
Point p = new Point(x, y);
p = base.PointToScreen(p);
if (this.mouseEvents && !base.ValidationCancelled)
{
this.mouseEvents = false;
if (base.Capture && rectangle.Contains(p))
{
this.OnClick(new MouseEventArgs(MouseButtons.Left, 1, System.Windows.Forms.NativeMethods.Util.SignedLOWORD(m.LParam), System.Windows.Forms.NativeMethods.Util.SignedHIWORD(m.LParam), 0));
this.OnMouseClick(new MouseEventArgs(MouseButtons.Left, 1, System.Windows.Forms.NativeMethods.Util.SignedLOWORD(m.LParam), System.Windows.Forms.NativeMethods.Util.SignedHIWORD(m.LParam), 0));
}
base.WndProc(ref m);
return;
}
base.CaptureInternal = false;
this.DefWndProc(ref m);
return;
}
case 0x210:
this.WmParentNotify(ref m);
return;
case 0x202b:
this.WmReflectDrawItem(ref m);
return;
case 0x202c:
this.WmReflectMeasureItem(ref m);
return;
case 0x2111:
this.WmReflectCommand(ref m);
return;
case 0x2a3:
this.DefWndProc(ref m);
this.OnMouseLeaveInternal(EventArgs.Empty);
return;
case 0x318:
if ((base.GetStyle(ControlStyles.UserPaint) || (this.FlatStyle != System.Windows.Forms.FlatStyle.Flat)) && (this.FlatStyle != System.Windows.Forms.FlatStyle.Popup))
{
goto Label_04EF;
}
this.DefWndProc(ref m);
if ((((int) ((long) m.LParam)) & 4) != 4)
{
goto Label_04EF;
}
if ((!base.GetStyle(ControlStyles.UserPaint) && (this.FlatStyle == System.Windows.Forms.FlatStyle.Flat)) || (this.FlatStyle == System.Windows.Forms.FlatStyle.Popup))
{
using (Graphics graphics3 = Graphics.FromHdcInternal(m.WParam))
{
this.FlatComboBoxAdapter.DrawFlatCombo(this, graphics3);
}
}
return;
default:
if (m.Msg == System.Windows.Forms.NativeMethods.WM_MOUSEENTER)
{
this.DefWndProc(ref m);
this.OnMouseEnterInternal(EventArgs.Empty);
return;
}
base.WndProc(ref m);
return;
}
try
{
this.fireLostFocus = false;
base.WndProc(ref m);
if (((!Application.RenderWithVisualStyles && !base.GetStyle(ControlStyles.UserPaint)) && (this.DropDownStyle == ComboBoxStyle.DropDownList)) && ((this.FlatStyle == System.Windows.Forms.FlatStyle.Flat) || (this.FlatStyle == System.Windows.Forms.FlatStyle.Popup)))
{
System.Windows.Forms.UnsafeNativeMethods.PostMessage(new HandleRef(this, base.Handle), 0x2a3, 0, 0);
}
return;
}
finally
{
this.fireLostFocus = true;
}
Label_017F:
m.Result = this.InitializeDCForWmCtlColor(m.WParam, m.Msg);
return;
Label_04EF:
base.WndProc(ref m);
}
public IntNativeMethods.RegionFlags CombineRegion(WindowsRegion region1, WindowsRegion region2, RegionCombineMode mode)
{
return(IntUnsafeNativeMethods.CombineRgn(new HandleRef(this, this.HRegion), new HandleRef(region1, region1.HRegion), new HandleRef(region2, region2.HRegion), mode));
}
public void SetClip(WindowsRegion region)
{
HandleRef hDC = new HandleRef(this, this.Hdc);
HandleRef hRgn = new HandleRef(region, region.HRegion);
IntUnsafeNativeMethods.SelectClipRgn(hDC, hRgn);
}
public void IntersectClip(WindowsRegion wr)
{
if (wr.HRegion != IntPtr.Zero)
{
using (WindowsRegion region = new WindowsRegion(0, 0, 0, 0))
{
if (IntUnsafeNativeMethods.GetClipRgn(new HandleRef(this, this.Hdc), new HandleRef(region, region.HRegion)) == 1)
{
wr.CombineRegion(region, wr, RegionCombineMode.AND);
}
this.SetClip(wr);
}
}
}
/// <summary>
/// Combines region1 & region2 into this region. The regions cannot be null.
/// The three regions need not be distinct. For example, the sourceRgn1 can equal this region.
/// </summary>
public Interop.RegionType CombineRegion(WindowsRegion region1, WindowsRegion region2, Interop.Gdi32.CombineMode mode)
{
return(Interop.Gdi32.CombineRgn(new HandleRef(this, HRegion), new HandleRef(region1, region1.HRegion), new HandleRef(region2, region2.HRegion), mode));
}
public IntNativeMethods.RegionFlags CombineRegion(WindowsRegion region1, WindowsRegion region2, RegionCombineMode mode)
{
return IntUnsafeNativeMethods.CombineRgn(new HandleRef(this, this.HRegion), new HandleRef(region1, region1.HRegion), new HandleRef(region2, region2.HRegion), mode);
}