public void DrawLine(WindowsPen pen, int x1, int y1, int x2, int y2)
{
HandleRef hdc = new HandleRef(this.dc, this.dc.Hdc);
DeviceContextBinaryRasterOperationFlags binaryRasterOperation = this.dc.BinaryRasterOperation;
DeviceContextBackgroundMode backgroundMode = this.dc.BackgroundMode;
if (binaryRasterOperation != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
binaryRasterOperation = this.dc.SetRasterOperation(DeviceContextBinaryRasterOperationFlags.CopyPen);
}
if (backgroundMode != DeviceContextBackgroundMode.Transparent)
{
backgroundMode = this.dc.SetBackgroundMode(DeviceContextBackgroundMode.Transparent);
}
if (pen != null)
{
this.dc.SelectObject(pen.HPen, GdiObjectType.Pen);
}
IntNativeMethods.POINT pt = new IntNativeMethods.POINT();
IntUnsafeNativeMethods.MoveToEx(hdc, x1, y1, pt);
IntUnsafeNativeMethods.LineTo(hdc, x2, y2);
if (backgroundMode != DeviceContextBackgroundMode.Transparent)
{
this.dc.SetBackgroundMode(backgroundMode);
}
if (binaryRasterOperation != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
this.dc.SetRasterOperation(binaryRasterOperation);
}
IntUnsafeNativeMethods.MoveToEx(hdc, pt.x, pt.y, null);
}
public void DrawText(string text, WindowsFont font, Rectangle bounds, Color foreColor, Color backColor, IntTextFormatFlags flags)
{
if (!string.IsNullOrEmpty(text) && (foreColor != Color.Transparent))
{
HandleRef hdc = new HandleRef(this.dc, this.dc.Hdc);
if (this.dc.TextAlignment != DeviceContextTextAlignment.Top)
{
this.dc.SetTextAlignment(DeviceContextTextAlignment.Top);
}
if (!foreColor.IsEmpty && (foreColor != this.dc.TextColor))
{
this.dc.SetTextColor(foreColor);
}
if (font != null)
{
this.dc.SelectFont(font);
}
DeviceContextBackgroundMode newMode = (backColor.IsEmpty || (backColor == Color.Transparent)) ? DeviceContextBackgroundMode.Transparent : DeviceContextBackgroundMode.Opaque;
if (this.dc.BackgroundMode != newMode)
{
this.dc.SetBackgroundMode(newMode);
}
if ((newMode != DeviceContextBackgroundMode.Transparent) && (backColor != this.dc.BackgroundColor))
{
this.dc.SetBackgroundColor(backColor);
}
IntNativeMethods.DRAWTEXTPARAMS textMargins = this.GetTextMargins(font);
bounds = AdjustForVerticalAlignment(hdc, text, bounds, flags, textMargins);
if (bounds.Width == MaxSize.Width)
{
bounds.Width -= bounds.X;
}
if (bounds.Height == MaxSize.Height)
{
bounds.Height -= bounds.Y;
}
IntNativeMethods.RECT lpRect = new IntNativeMethods.RECT(bounds);
IntUnsafeNativeMethods.DrawTextEx(hdc, text, ref lpRect, (int)flags, textMargins);
}
}
public unsafe void DrawLine(WindowsPen pen, int x1, int y1, int x2, int y2)
{
HandleRef hdc = new HandleRef(dc, dc.Hdc);
DeviceContextBinaryRasterOperationFlags rasterOp = dc.BinaryRasterOperation;
DeviceContextBackgroundMode bckMode = dc.BackgroundMode;
if (rasterOp != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
rasterOp = dc.SetRasterOperation(DeviceContextBinaryRasterOperationFlags.CopyPen);
}
if (bckMode != DeviceContextBackgroundMode.Transparent)
{
bckMode = dc.SetBackgroundMode(DeviceContextBackgroundMode.Transparent);
}
if (pen != null)
{
dc.SelectObject(pen.HPen, GdiObjectType.Pen);
}
Point oldPoint = new Point();
IntUnsafeNativeMethods.MoveToEx(hdc, x1, y1, &oldPoint);
IntUnsafeNativeMethods.LineTo(hdc, x2, y2);
if (bckMode != DeviceContextBackgroundMode.Transparent)
{
dc.SetBackgroundMode(bckMode);
}
if (rasterOp != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
dc.SetRasterOperation(rasterOp);
}
IntUnsafeNativeMethods.MoveToEx(hdc, oldPoint.X, oldPoint.Y, &oldPoint);
}
/// <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.TextFormatFlags 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.TextFormatFlags.DT_CALCRECT) == 0, "DT_CALCRECT flag is set, text won't be drawn");
HandleRef hdc = new HandleRef(dc, dc.Hdc);
// DrawText requires default text alignment.
if (dc.TextAlignment != DeviceContextTextAlignment.Default)
{
dc.SetTextAlignment(DeviceContextTextAlignment.Default);
}
// color empty means use the one currently selected in the dc.
if (!foreColor.IsEmpty && foreColor != dc.TextColor)
{
dc.SetTextColor(foreColor);
}
if (font != null)
{
dc.SelectFont(font);
}
DeviceContextBackgroundMode newBackGndMode = (backColor.IsEmpty || backColor == Color.Transparent) ?
DeviceContextBackgroundMode.Transparent :
DeviceContextBackgroundMode.Opaque;
if (dc.BackgroundMode != newBackGndMode)
{
dc.SetBackgroundMode(newBackGndMode);
}
if (newBackGndMode != DeviceContextBackgroundMode.Transparent && backColor != dc.BackgroundColor)
{
dc.SetBackgroundColor(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).
}
/// <devdoc>
/// Sets the DC background mode and returns the old value.
/// </devdoc>
public DeviceContextBackgroundMode SetBackgroundMode(DeviceContextBackgroundMode newMode)
{
return((DeviceContextBackgroundMode)IntUnsafeNativeMethods.SetBkMode(new HandleRef(this, this.Hdc), (int)newMode));
}
/// <devdoc>
/// 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.
/// </devdoc>
public void DrawText(string text, WindowsFont font, Rectangle bounds, Color foreColor, Color backColor, IntTextFormatFlags 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 & IntTextFormatFlags.CalculateRectangle) == 0, "CalculateRectangle flag is set, text won't be drawn");
HandleRef hdc = new HandleRef(this.dc, this.dc.Hdc);
// DrawText requires default text alignment.
if (this.dc.TextAlignment != DeviceContextTextAlignment.Default)
{
this.dc.SetTextAlignment(DeviceContextTextAlignment.Default);
}
// color empty means use the one currently selected in the dc.
if (!foreColor.IsEmpty && foreColor != this.dc.TextColor)
{
this.dc.SetTextColor(foreColor);
}
if (font != null)
{
this.dc.SelectFont(font);
}
DeviceContextBackgroundMode newBackGndMode = (backColor.IsEmpty || backColor == Color.Transparent) ?
DeviceContextBackgroundMode.Transparent :
DeviceContextBackgroundMode.Opaque;
if (this.dc.BackgroundMode != newBackGndMode)
{
this.dc.SetBackgroundMode(newBackGndMode);
}
if (newBackGndMode != DeviceContextBackgroundMode.Transparent && backColor != this.dc.BackgroundColor)
{
this.dc.SetBackgroundColor(backColor);
}
IntNativeMethods.DRAWTEXTPARAMS dtparams = GetTextMargins(font);
bounds = AdjustForVerticalAlignment(hdc, text, bounds, flags, dtparams);
// Adjust unbounded rect to avoid overflow since Rectangle ctr does not do param validation.
if (bounds.Width == MaxSize.Width)
{
bounds.Width = bounds.Width - bounds.X;
}
if (bounds.Height == MaxSize.Height)
{
bounds.Height = bounds.Height - bounds.Y;
}
IntNativeMethods.RECT rect = new IntNativeMethods.RECT(bounds);
IntUnsafeNativeMethods.DrawTextEx(hdc, text, ref rect, (int)flags, dtparams);
/* No need to restore previous objects into the dc (see comments on top of the class).
*
* if (hOldFont != IntPtr.Zero)
* {
* IntUnsafeNativeMethods.SelectObject(hdc, new HandleRef( null, hOldFont));
* }
*
* if( foreColor != textColor )
* {
* this.dc.SetTextColor(textColor);
* }
*
* if( backColor != bkColor )
* {
* this.dc.SetBackgroundColor(bkColor);
* }
*
* if( bckMode != newMode )
* {
* this.dc.SetBackgroundMode(bckMode);
* }
*
* if( align != DeviceContextTextAlignment.Default )
* {
* // Default text alignment required by DrewText.
* this.dc.SetTextAlignment(align);
* }
*/
}
public DeviceContextBackgroundMode SetBackgroundMode(DeviceContextBackgroundMode newMode)
{
return (DeviceContextBackgroundMode) IntUnsafeNativeMethods.SetBkMode(new HandleRef(this, this.Hdc), (int) newMode);
}