public WindowsPen(DeviceContext dc, WindowsPenStyle style, int width, Color color)
{
this.style = style;
this.width = width;
this.color = color;
this.dc = dc;
}
internal static void RemoveDeviceContext(DeviceContext dc)
{
if (activeDeviceContexts != null)
{
activeDeviceContexts.RemoveByHashCode(dc);
}
}
public WindowsPen(DeviceContext dc, WindowsPenStyle style, int width, WindowsBrush windowsBrush)
{
this.style = style;
this.wndBrush = (WindowsBrush) windowsBrush.Clone();
this.width = width;
this.color = windowsBrush.Color;
this.dc = dc;
}
internal static void AddDeviceContext(DeviceContext dc)
{
if (activeDeviceContexts == null)
{
activeDeviceContexts = new System.Windows.Forms.ClientUtils.WeakRefCollection();
activeDeviceContexts.RefCheckThreshold = 20;
}
if (!activeDeviceContexts.Contains(dc))
{
dc.Disposing += new EventHandler(DeviceContexts.OnDcDisposing);
activeDeviceContexts.Add(dc);
}
}
public WindowsPen(DeviceContext dc, Color color) : this(dc, WindowsPenStyle.Cosmetic, 1, color)
{
}
public WindowsPen(DeviceContext dc) : this(dc, WindowsPenStyle.Cosmetic, 1, Color.Black)
{
}
public WindowsBrush(DeviceContext dc, System.Drawing.Color color)
{
this.color = System.Drawing.Color.White;
this.dc = dc;
this.color = color;
}
public DCMapping(HandleRef hDC, Rectangle bounds) {
if (hDC.Handle == IntPtr.Zero) {
throw new ArgumentNullException("hDC");
}
bool success;
NativeMethods.POINT viewportOrg = new NativeMethods.POINT();
HandleRef hOriginalClippingRegion = NativeMethods.NullHandleRef;
NativeMethods.RegionFlags originalRegionType = NativeMethods.RegionFlags.NULLREGION;
this.translatedBounds = bounds;
this.graphics = null;
this.dc = DeviceContext.FromHdc(hDC.Handle);
this.dc.SaveHdc();
// Retrieve the x-coordinates and y-coordinates of the viewport origin for the specified device context.
success = SafeNativeMethods.GetViewportOrgEx(hDC, viewportOrg);
Debug.Assert(success, "GetViewportOrgEx() failed.");
// Create a new rectangular clipping region based off of the bounds specified, shifted over by the x & y specified in the viewport origin.
HandleRef hClippingRegion = new HandleRef(null, SafeNativeMethods.CreateRectRgn(viewportOrg.x + bounds.Left, viewportOrg.y + bounds.Top, viewportOrg.x + bounds.Right, viewportOrg.y + bounds.Bottom));
Debug.Assert(hClippingRegion.Handle != IntPtr.Zero, "CreateRectRgn() failed.");
try
{
// Create an empty region oriented at 0,0 so we can populate it with the original clipping region of the hDC passed in.
hOriginalClippingRegion = new HandleRef(this, SafeNativeMethods.CreateRectRgn(0, 0, 0, 0));
Debug.Assert(hOriginalClippingRegion.Handle != IntPtr.Zero, "CreateRectRgn() failed.");
// Get the clipping region from the hDC: result = {-1 = error, 0 = no region, 1 = success} per MSDN
int result = SafeNativeMethods.GetClipRgn(hDC, hOriginalClippingRegion);
Debug.Assert(result != -1, "GetClipRgn() failed.");
// Shift the viewpoint origint by coordinates specified in "bounds".
NativeMethods.POINT lastViewPort = new NativeMethods.POINT();
success = SafeNativeMethods.SetViewportOrgEx(hDC, viewportOrg.x + bounds.Left, viewportOrg.y + bounds.Top, lastViewPort);
Debug.Assert(success, "SetViewportOrgEx() failed.");
if (result != 0)
{
// Get the origninal clipping region so we can determine its type (we'll check later if we've restored the region back properly.)
NativeMethods.RECT originalClipRect = new NativeMethods.RECT();
originalRegionType = (NativeMethods.RegionFlags)SafeNativeMethods.GetRgnBox(hOriginalClippingRegion, ref originalClipRect);
Debug.Assert(originalRegionType != NativeMethods.RegionFlags.ERROR, "ERROR returned from SelectClipRgn while selecting the original clipping region..");
if (originalRegionType == NativeMethods.RegionFlags.SIMPLEREGION)
{
// Find the intersection of our clipping region and the current clipping region (our parent's)
// Returns a NULLREGION, the two didn't intersect.
// Returns a SIMPLEREGION, the two intersected
// Resulting region (stuff that was in hOriginalClippingRegion AND hClippingRegion is placed in hClippingRegion
NativeMethods.RegionFlags combineResult = (NativeMethods.RegionFlags)SafeNativeMethods.CombineRgn(hClippingRegion, hClippingRegion, hOriginalClippingRegion, NativeMethods.RGN_AND);
Debug.Assert((combineResult == NativeMethods.RegionFlags.SIMPLEREGION) ||
(combineResult == NativeMethods.RegionFlags.NULLREGION),
"SIMPLEREGION or NULLREGION expected.");
}
}
else
{
// If there was no clipping region, then the result is a simple region.
// We don't need to keep track of the original now, since it is empty.
SafeNativeMethods.DeleteObject(hOriginalClippingRegion);
hOriginalClippingRegion = new HandleRef(null, IntPtr.Zero);
originalRegionType = NativeMethods.RegionFlags.SIMPLEREGION;
}
// Select the new clipping region; make sure it's a SIMPLEREGION or NULLREGION
NativeMethods.RegionFlags selectResult = (NativeMethods.RegionFlags)SafeNativeMethods.SelectClipRgn(hDC, hClippingRegion);
Debug.Assert((selectResult == NativeMethods.RegionFlags.SIMPLEREGION ||
selectResult == NativeMethods.RegionFlags.NULLREGION),
"SIMPLEREGION or NULLLREGION expected.");
}
catch (Exception ex)
{
if (ClientUtils.IsSecurityOrCriticalException(ex))
{
throw;
}
this.dc.RestoreHdc();
this.dc.Dispose();
}
finally {
// Delete the new clipping region, as the clipping region for the HDC is now set
// to this rectangle. Hold on to hOriginalClippingRegion, as we'll need to restore
// it when this object is disposed.
success = SafeNativeMethods.DeleteObject(hClippingRegion);
Debug.Assert(success, "DeleteObject(hClippingRegion) failed.");
if (hOriginalClippingRegion.Handle != IntPtr.Zero) {
success = SafeNativeMethods.DeleteObject(hOriginalClippingRegion);
Debug.Assert(success, "DeleteObject(hOriginalClippingRegion) failed.");
}
}
}
void RestoreMirrorDC() {
if (parent.IsMirrored && mirrordc != null) {
mirrordc.ViewportExtent = mirrordcExtent;
mirrordc.ViewportOrigin = mirrordcOrigin;
mirrordc.SetMapMode(mirrordcMode);
mirrordc.RestoreHdc();
mirrordc.Dispose();
}
mirrordc= null;
mirrordcExtent = Size.Empty;
mirrordcOrigin = Point.Empty;
mirrordcMode = DeviceContextMapMode.Text;
}
public void Dispose()
{
if (this.graphics != null)
{
this.graphics.Dispose();
this.graphics = null;
}
if (this.dc != null)
{
this.dc.RestoreHdc();
this.dc.Dispose();
this.dc = null;
}
}
public WindowsSolidBrush(DeviceContext dc) : base(dc)
{
}
internal static bool IsMeasurementDC(DeviceContext dc)
{
WindowsGraphics currentMeasurementGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics();
return(((currentMeasurementGraphics != null) && (currentMeasurementGraphics.DeviceContext != null)) && (currentMeasurementGraphics.DeviceContext.Hdc == dc.Hdc));
}
public WindowsSolidBrush(DeviceContext dc, Color color) : base(dc, color)
{
}
public WindowsBrush(DeviceContext dc, Color color)
{
DC = dc;
Color = color;
}
public WindowsBrush(DeviceContext dc)
{
DC = dc;
}
public WindowsPen(DeviceContext dc, WindowsBrush windowsBrush) : this(dc, WindowsPenStyle.Cosmetic, 1, windowsBrush)
{
}
private void CreateMirrorDC(IntPtr hdc, int originOffset)
{
this.mirrordc = DeviceContext.FromHdc(hdc);
if (this.parent.IsMirrored && (this.mirrordc != null))
{
this.mirrordc.SaveHdc();
this.mirrordcExtent = this.mirrordc.ViewportExtent;
this.mirrordcOrigin = this.mirrordc.ViewportOrigin;
this.mirrordcMode = this.mirrordc.SetMapMode(DeviceContextMapMode.Anisotropic);
this.mirrordc.ViewportExtent = new Size(-this.mirrordcExtent.Width, this.mirrordcExtent.Height);
this.mirrordc.ViewportOrigin = new Point(this.mirrordcOrigin.X + originOffset, this.mirrordcOrigin.Y);
}
}
public WindowsPen(DeviceContext dc) :
this(dc, default, CosmeticPenWidth, Color.Black)
{
}
public DCMapping(HandleRef hDC, Rectangle bounds)
{
if (hDC.Handle == IntPtr.Zero)
{
throw new ArgumentNullException("hDC");
}
System.Windows.Forms.NativeMethods.POINT point = new System.Windows.Forms.NativeMethods.POINT();
HandleRef nullHandleRef = System.Windows.Forms.NativeMethods.NullHandleRef;
System.Windows.Forms.NativeMethods.RegionFlags nULLREGION = System.Windows.Forms.NativeMethods.RegionFlags.NULLREGION;
this.translatedBounds = bounds;
this.graphics = null;
this.dc = DeviceContext.FromHdc(hDC.Handle);
this.dc.SaveHdc();
System.Windows.Forms.SafeNativeMethods.GetViewportOrgEx(hDC, point);
HandleRef hRgn = new HandleRef(null, System.Windows.Forms.SafeNativeMethods.CreateRectRgn(point.x + bounds.Left, point.y + bounds.Top, point.x + bounds.Right, point.y + bounds.Bottom));
try
{
nullHandleRef = new HandleRef(this, System.Windows.Forms.SafeNativeMethods.CreateRectRgn(0, 0, 0, 0));
int clipRgn = System.Windows.Forms.SafeNativeMethods.GetClipRgn(hDC, nullHandleRef);
System.Windows.Forms.NativeMethods.POINT point2 = new System.Windows.Forms.NativeMethods.POINT();
System.Windows.Forms.SafeNativeMethods.SetViewportOrgEx(hDC, point.x + bounds.Left, point.y + bounds.Top, point2);
if (clipRgn != 0)
{
System.Windows.Forms.NativeMethods.RECT clipRect = new System.Windows.Forms.NativeMethods.RECT();
if (System.Windows.Forms.SafeNativeMethods.GetRgnBox(nullHandleRef, ref clipRect) == 2)
{
System.Windows.Forms.SafeNativeMethods.CombineRgn(hRgn, hRgn, nullHandleRef, 1);
}
}
else
{
System.Windows.Forms.SafeNativeMethods.DeleteObject(nullHandleRef);
nullHandleRef = new HandleRef(null, IntPtr.Zero);
nULLREGION = System.Windows.Forms.NativeMethods.RegionFlags.SIMPLEREGION;
}
System.Windows.Forms.SafeNativeMethods.SelectClipRgn(hDC, hRgn);
}
catch (Exception exception)
{
if (System.Windows.Forms.ClientUtils.IsSecurityOrCriticalException(exception))
{
throw;
}
this.dc.RestoreHdc();
this.dc.Dispose();
}
finally
{
System.Windows.Forms.SafeNativeMethods.DeleteObject(hRgn);
if (nullHandleRef.Handle != IntPtr.Zero)
{
System.Windows.Forms.SafeNativeMethods.DeleteObject(nullHandleRef);
}
}
}
private void RestoreMirrorDC()
{
if (this.parent.IsMirrored && (this.mirrordc != null))
{
this.mirrordc.ViewportExtent = this.mirrordcExtent;
this.mirrordc.ViewportOrigin = this.mirrordcOrigin;
this.mirrordc.SetMapMode(this.mirrordcMode);
this.mirrordc.RestoreHdc();
this.mirrordc.Dispose();
}
this.mirrordc = null;
this.mirrordcExtent = Size.Empty;
this.mirrordcOrigin = Point.Empty;
this.mirrordcMode = DeviceContextMapMode.Text;
}
public WindowsPen(DeviceContext dc, Color color) :
this(dc, default, CosmeticPenWidth, color)
{
}
/// <devdoc>
///
/// VSWhidbey #455702.
///
/// Since we added mirroring to certain controls, we need to make sure the
/// error icons show up in the correct place. We cannot mirror the errorwindow
/// in EnsureCreated (although that would have been really easy), since we use
/// GDI+ for some of this code, and as we all know, GDI+ does not handle mirroring
/// at all.
///
/// To work around that we create our own mirrored dc when we need to.
///
/// </devdoc>
void CreateMirrorDC(IntPtr hdc, int originOffset) {
Debug.Assert(mirrordc == null, "Why is mirrordc non-null? Did you not call RestoreMirrorDC?");
mirrordc = DeviceContext.FromHdc(hdc);
if (parent.IsMirrored && mirrordc != null) {
mirrordc.SaveHdc();
mirrordcExtent = mirrordc.ViewportExtent;
mirrordcOrigin = mirrordc.ViewportOrigin;
mirrordcMode = mirrordc.SetMapMode(DeviceContextMapMode.Anisotropic);
mirrordc.ViewportExtent = new Size(-(mirrordcExtent.Width), mirrordcExtent.Height);
mirrordc.ViewportOrigin = new Point(mirrordcOrigin.X + originOffset, mirrordcOrigin.Y);
}
}
public WindowsPen(DeviceContext dc, WindowsBrush windowsBrush) :
this(dc, default, CosmeticPenWidth, windowsBrush)
{
}
public WindowsBrush(DeviceContext dc, System.Drawing.Color color)
{
this.color = System.Drawing.Color.White;
this.dc = dc;
this.color = color;
}
/// <summary>
/// Draws the text in the given bounds, using the given Font, foreColor and backColor, and according to the specified
/// TextFormatFlags flags.
///
/// If font is null, the font currently selected in the hdc is used.
///
/// If foreColor and/or backColor are Color.Empty, the hdc current text and/or background color are used.
/// </summary>
public void DrawText(string text, WindowsFont font, Rectangle bounds, Color foreColor, Color backColor, User32.DT flags)
{
if (string.IsNullOrEmpty(text) || foreColor == Color.Transparent)
{
return;
}
Debug.Assert(((uint)flags & GdiUnsupportedFlagMask) == 0, "Some custom flags were left over and are not GDI compliant!");
Debug.Assert((flags & User32.DT.CALCRECT) == 0, "CALCRECT flag is set, text won't be drawn");
HandleRef hdc = new HandleRef(DeviceContext, DeviceContext.Hdc);
// DrawText requires default text alignment.
if (DeviceContext.TextAlignment != default)
{
DeviceContext.TextAlignment = default;
}
// color empty means use the one currently selected in the dc.
if (!foreColor.IsEmpty && foreColor != DeviceContext.TextColor)
{
DeviceContext.TextColor = foreColor;
}
if (font != null)
{
DeviceContext.SelectFont(font);
}
Gdi32.BKMODE newBackGndMode = (backColor.IsEmpty || backColor == Color.Transparent) ?
Gdi32.BKMODE.TRANSPARENT :
Gdi32.BKMODE.OPAQUE;
if (DeviceContext.BackgroundMode != newBackGndMode)
{
DeviceContext.SetBackgroundMode(newBackGndMode);
}
if (newBackGndMode != Gdi32.BKMODE.TRANSPARENT && backColor != DeviceContext.BackgroundColor)
{
DeviceContext.BackgroundColor = backColor;
}
User32.DRAWTEXTPARAMS dtparams = GetTextMargins(font);
bounds = AdjustForVerticalAlignment(hdc, text, bounds, flags, ref dtparams);
// Adjust unbounded rect to avoid overflow since Rectangle ctr does not do param validation.
if (bounds.Width == MaxSize.Width)
{
bounds.Width -= bounds.X;
}
if (bounds.Height == MaxSize.Height)
{
bounds.Height -= bounds.Y;
}
var rect = new RECT(bounds);
User32.DrawTextExW(hdc, text, text.Length, ref rect, flags, ref dtparams);
// No need to restore previous objects into the dc (see comments on top of the class).
}
/// <summary>
/// Returns the Size in logical units of the given text using the given Font, and according to the formatting flags.
/// The proposed size is used to create a bounding rectangle as follows:
/// - If there are multiple lines of text, DrawText uses the width of the rectangle pointed to by
/// the lpRect parameter and extends the base of the rectangle to bound the last line of text.
/// - If the largest word is wider than the rectangle, the width is expanded.
/// - If the text is less than the width of the rectangle, the width is reduced.
/// - If there is only one line of text, DrawText modifies the right side of the rectangle so that
/// it bounds the last character in the line.
/// If the font is null, the hdc's current font will be used.
///
/// Note for vertical fonts (if ever supported): DrawTextEx uses GetTextExtentPoint32 for measuring the text and this
/// function has the following limitation (from MSDN):
/// - This function assumes that the text is horizontal, that is, that the escapement is always 0. This is true for both
/// the horizontal and vertical measurements of the text. The application must convert it explicitly.
/// </summary>
public Size MeasureText(string text, WindowsFont font, Size proposedSize, User32.DT flags)
{
Debug.Assert(((uint)flags & GdiUnsupportedFlagMask) == 0, "Some custom flags were left over and are not GDI compliant!");
if (string.IsNullOrEmpty(text))
{
return(Size.Empty);
}
// DrawText returns a rectangle useful for aligning, but not guaranteed to encompass all
// pixels (its not a FitBlackBox, if the text is italicized, it will overhang on the right.)
// So we need to account for this.
#if OPTIMIZED_MEASUREMENTDC
User32.DRAWTEXTPARAMS dtparams;
// use the cache if we've got it
if (MeasurementDCInfo.IsMeasurementDC(DeviceContext))
{
dtparams = MeasurementDCInfo.GetTextMargins(this, font);
}
else
{
dtparams = GetTextMargins(font);
}
#else
User32.DRAWTEXTPARAMS dtparams = GetTextMargins(font);
#endif
// If Width / Height are < 0, we need to make them larger or DrawText will return
// an unbounded measurement when we actually trying to make it very narrow.
int minWidth = 1 + dtparams.iLeftMargin + dtparams.iRightMargin;
if (proposedSize.Width <= minWidth)
{
proposedSize.Width = minWidth;
}
if (proposedSize.Height <= 0)
{
proposedSize.Height = 1;
}
var rect = new RECT(0, 0, proposedSize.Width, proposedSize.Height);
if (font != null)
{
DeviceContext.SelectFont(font);
}
// If proposedSize.Height >= MaxSize.Height it is assumed bounds needed. If flags contain SINGLELINE and
// VCENTER or BOTTOM options, DrawTextEx does not bind the rectangle to the actual text height since
// it assumes the text is to be vertically aligned; we need to clear the VCENTER and BOTTOM flags to
// get the actual text bounds.
if (proposedSize.Height >= MaxSize.Height && (flags & User32.DT.SINGLELINE) != 0)
{
// Clear vertical-alignment flags.
flags &= ~(User32.DT.BOTTOM | User32.DT.VCENTER);
}
if (proposedSize.Width == MaxSize.Width)
{
// PERF: No constraining width means no word break.
// in this case, we dont care about word wrapping - there should be enough room to fit it all
flags &= ~(User32.DT.WORDBREAK);
}
flags |= User32.DT.CALCRECT;
User32.DrawTextExW(DeviceContext.Hdc, text, text.Length, ref rect, flags, ref dtparams);
return(rect.Size);
}
internal static bool IsMeasurementDC(DeviceContext dc)
{
WindowsGraphics currentMeasurementGraphics = WindowsGraphicsCacheManager.GetCurrentMeasurementGraphics();
return (((currentMeasurementGraphics != null) && (currentMeasurementGraphics.DeviceContext != null)) && (currentMeasurementGraphics.DeviceContext.Hdc == dc.Hdc));
}
public void Dispose() {
if( graphics != null ){
// Reset GDI+ if used.
// we need to dispose the graphics object first, as it will do
// some restoration to the ViewPort and ClipRectangle to restore the hDC to
// the same state it was created in
graphics.Dispose();
graphics = null;
}
if (this.dc != null) {
// Now properly reset GDI.
this.dc.RestoreHdc();
this.dc.Dispose();
this.dc = null;
}
}
public WindowsGraphics(DeviceContext dc)
{
Debug.Assert(dc != null, "null dc!");
DeviceContext = dc;
DeviceContext.SaveHdc();
}
