public DRAWTEXTPARAMS(IntNativeMethods.DRAWTEXTPARAMS original) { this.cbSize = Marshal.SizeOf(typeof(IntNativeMethods.DRAWTEXTPARAMS)); this.iLeftMargin = original.iLeftMargin; this.iRightMargin = original.iRightMargin; this.iTabLength = original.iTabLength; }
internal static IntNativeMethods.DRAWTEXTPARAMS GetTextMargins(WindowsGraphics wg, WindowsFont font) { CachedInfo cachedMeasurementDCInfo = MeasurementDCInfo.cachedMeasurementDCInfo; if (((cachedMeasurementDCInfo == null) || (cachedMeasurementDCInfo.LeftTextMargin <= 0)) || ((cachedMeasurementDCInfo.RightTextMargin <= 0) || (font != cachedMeasurementDCInfo.LastUsedFont))) { if (cachedMeasurementDCInfo == null) { cachedMeasurementDCInfo = new CachedInfo(); MeasurementDCInfo.cachedMeasurementDCInfo = cachedMeasurementDCInfo; } IntNativeMethods.DRAWTEXTPARAMS textMargins = wg.GetTextMargins(font); cachedMeasurementDCInfo.LeftTextMargin = textMargins.iLeftMargin; cachedMeasurementDCInfo.RightTextMargin = textMargins.iRightMargin; } return(new IntNativeMethods.DRAWTEXTPARAMS(cachedMeasurementDCInfo.LeftTextMargin, cachedMeasurementDCInfo.RightTextMargin)); }
public Size MeasureText(string text, WindowsFont font, Size proposedSize, IntTextFormatFlags flags) { if (string.IsNullOrEmpty(text)) { return(Size.Empty); } IntNativeMethods.DRAWTEXTPARAMS lpDTParams = null; if (MeasurementDCInfo.IsMeasurementDC(this.DeviceContext)) { lpDTParams = MeasurementDCInfo.GetTextMargins(this, font); } if (lpDTParams == null) { lpDTParams = this.GetTextMargins(font); } int num = (1 + lpDTParams.iLeftMargin) + lpDTParams.iRightMargin; if (proposedSize.Width <= num) { proposedSize.Width = num; } if (proposedSize.Height <= 0) { proposedSize.Height = 1; } IntNativeMethods.RECT lpRect = IntNativeMethods.RECT.FromXYWH(0, 0, proposedSize.Width, proposedSize.Height); HandleRef hDC = new HandleRef(null, this.dc.Hdc); if (font != null) { this.dc.SelectFont(font); } if ((proposedSize.Height >= MaxSize.Height) && ((flags & IntTextFormatFlags.SingleLine) != IntTextFormatFlags.Default)) { flags &= ~(IntTextFormatFlags.Bottom | IntTextFormatFlags.VerticalCenter); } if (proposedSize.Width == MaxSize.Width) { flags &= ~IntTextFormatFlags.WordBreak; } flags |= IntTextFormatFlags.CalculateRectangle; IntUnsafeNativeMethods.DrawTextEx(hDC, text, ref lpRect, (int)flags, lpDTParams); return(lpRect.Size); }
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 static int DrawTextEx(HandleRef hDC, string text, ref IntNativeMethods.RECT lpRect, int nFormat, [In, Out] IntNativeMethods.DRAWTEXTPARAMS lpDTParams) { if (Marshal.SystemDefaultCharSize == 1) { lpRect.top = Math.Min(0x7fff, lpRect.top); lpRect.left = Math.Min(0x7fff, lpRect.left); lpRect.right = Math.Min(0x7fff, lpRect.right); lpRect.bottom = Math.Min(0x7fff, lpRect.bottom); int num2 = WideCharToMultiByte(0, 0, text, text.Length, null, 0, IntPtr.Zero, IntPtr.Zero); byte[] pOutBytes = new byte[num2]; WideCharToMultiByte(0, 0, text, text.Length, pOutBytes, pOutBytes.Length, IntPtr.Zero, IntPtr.Zero); num2 = Math.Min(num2, 0x2000); return(DrawTextExA(hDC, pOutBytes, num2, ref lpRect, nFormat, lpDTParams)); } return(DrawTextExW(hDC, text, text.Length, ref lpRect, nFormat, lpDTParams)); }
public static extern int DrawTextExW(HandleRef hDC, string lpszString, int nCount, ref IntNativeMethods.RECT lpRect, int nFormat, [In, Out] IntNativeMethods.DRAWTEXTPARAMS lpDTParams);
/// <summary> /// The GDI DrawText does not do multiline alignment when IntTextFormatFlags.SingleLine is not set. This /// adjustment is to workaround that limitation. We don't want to duplicate SelectObject calls here, /// so put your Font in the dc before calling this. /// /// AdjustForVerticalAlignment is only used when the text is multiline and it fits inside the bounds passed in. /// In that case we want the horizontal center of the multiline text to be at the horizontal center of the bounds. /// /// If the text is multiline and it does not fit inside the bounds passed in, then return the bounds that were passed in. /// This way we paint the top of the text at the top of the bounds passed in. /// </summary> public static Rectangle AdjustForVerticalAlignment(HandleRef hdc, string text, Rectangle bounds, IntTextFormatFlags flags, IntNativeMethods.DRAWTEXTPARAMS dtparams) { Debug.Assert(((uint)flags & GdiUnsupportedFlagMask) == 0, "Some custom flags were left over and are not GDI compliant!"); // Ok if any Top (Cannot test IntTextFormatFlags.Top because it is 0), single line text or measuring text. bool isTop = (flags & IntTextFormatFlags.Bottom) == 0 && (flags & IntTextFormatFlags.VerticalCenter) == 0; if (isTop || ((flags & IntTextFormatFlags.SingleLine) != 0) || ((flags & IntTextFormatFlags.CalculateRectangle) != 0)) { return(bounds); } IntNativeMethods.RECT rect = new IntNativeMethods.RECT(bounds); // Get the text bounds. flags |= IntTextFormatFlags.CalculateRectangle; int textHeight = IntUnsafeNativeMethods.DrawTextEx(hdc, text, ref rect, (int)flags, dtparams); // if the text does not fit inside the bounds then return the bounds that were passed in if (textHeight > bounds.Height) { return(bounds); } Rectangle adjustedBounds = bounds; if ((flags & IntTextFormatFlags.VerticalCenter) != 0) // Middle { adjustedBounds.Y = adjustedBounds.Top + adjustedBounds.Height / 2 - textHeight / 2; } else // Bottom. { adjustedBounds.Y = adjustedBounds.Bottom - textHeight; } return(adjustedBounds); }
/// <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, IntTextFormatFlags 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. // IntNativeMethods.DRAWTEXTPARAMS dtparams = null; #if OPTIMIZED_MEASUREMENTDC // use the cache if we've got it if (MeasurementDCInfo.IsMeasurementDC(DeviceContext)) { dtparams = MeasurementDCInfo.GetTextMargins(this, font); } #endif if (dtparams == null) { dtparams = GetTextMargins(font); } // // 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; } IntNativeMethods.RECT rect = IntNativeMethods.RECT.FromXYWH(0, 0, proposedSize.Width, proposedSize.Height); HandleRef hdc = new HandleRef(null, dc.Hdc); if (font != null) { dc.SelectFont(font); } // If proposedSize.Height >= MaxSize.Height it is assumed bounds needed. If flags contain SingleLine and // VerticalCenter 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 VerticalCenter and Bottom flags to // get the actual text bounds. if (proposedSize.Height >= MaxSize.Height && (flags & IntTextFormatFlags.SingleLine) != 0) { // Clear vertical-alignment flags. flags &= ~(IntTextFormatFlags.Bottom | IntTextFormatFlags.VerticalCenter); } 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 &= ~(IntTextFormatFlags.WordBreak); } flags |= IntTextFormatFlags.CalculateRectangle; 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 ) * { * this.dc.SelectObject(hOldFont); * } */ return(rect.Size); }
/// <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, 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(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); } 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.X; } if (bounds.Height == MaxSize.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). }
public static int DrawTextEx(HandleRef hDC, string text, ref IntNativeMethods.RECT lpRect, int nFormat, [In, Out] IntNativeMethods.DRAWTEXTPARAMS lpDTParams) { int retVal = DrawTextExW(hDC, text, text.Length, ref lpRect, nFormat, lpDTParams); DbgUtil.AssertWin32(retVal != 0, "DrawTextEx(hdc=[0x{0:X8}], text=[{1}], rect=[{2}], flags=[{3}] failed.", hDC.Handle, text, lpRect, nFormat); return(retVal); }
public static Rectangle AdjustForVerticalAlignment(HandleRef hdc, string text, Rectangle bounds, IntTextFormatFlags flags, IntNativeMethods.DRAWTEXTPARAMS dtparams) { if (((((flags & IntTextFormatFlags.Bottom) == IntTextFormatFlags.Default) && ((flags & IntTextFormatFlags.VerticalCenter) == IntTextFormatFlags.Default)) || ((flags & IntTextFormatFlags.SingleLine) != IntTextFormatFlags.Default)) || ((flags & IntTextFormatFlags.CalculateRectangle) != IntTextFormatFlags.Default)) { return(bounds); } IntNativeMethods.RECT lpRect = new IntNativeMethods.RECT(bounds); flags |= IntTextFormatFlags.CalculateRectangle; int num = IntUnsafeNativeMethods.DrawTextEx(hdc, text, ref lpRect, (int)flags, dtparams); if (num > bounds.Height) { return(bounds); } Rectangle rectangle = bounds; if ((flags & IntTextFormatFlags.VerticalCenter) != IntTextFormatFlags.Default) { rectangle.Y = (rectangle.Top + (rectangle.Height / 2)) - (num / 2); return(rectangle); } rectangle.Y = rectangle.Bottom - num; return(rectangle); }