Ejemplo n.º 1
0
        /// <summary>
        /// Provides the size, in pixels, of the specified text.
        /// </summary>
        /// <param name="dc">The device context in which to measure the text.</param>
        /// <param name="text">The text to measure.</param>
        /// <param name="font">The <see cref="Font"/> to apply to the measured text.</param>
        /// <param name="textFormat">A bitwise combination of the <see cref="TextFormatFlags" /> values.</param>
        /// <returns>The <see cref="Size"/>, in pixels, of <paramref name="text"/> drawn with the specified <paramref name="font"/> and format.</returns>
        /// <exception cref="NotSupportedException">The current operating system does not support glass, or the Desktop Window Manager is not enabled.</exception>
        /// <exception cref="ArgumentNullException"><paramref name="dc"/>, <paramref name="text"/> or <paramref name="font"/> is <see langword="null"/>.</exception>
        public static Size MeasureCompositedText(IDeviceContext dc, string text, Font font, TextFormatFlags textFormat)
        {
            if (!IsDwmCompositionEnabled)
            {
                throw new NotSupportedException(Properties.Resources.GlassNotSupportedError);
            }

            if (dc == null)
            {
                throw new ArgumentNullException("dc");
            }
            if (text == null)
            {
                throw new ArgumentNullException("text");
            }
            if (font == null)
            {
                throw new ArgumentNullException("font");
            }

            IntPtr primaryHdc = dc.GetHdc();

            try
            {
                Rectangle bounds = new Rectangle(0, 0, int.MaxValue, int.MaxValue);

                using (SafeDeviceHandle memoryHdc = NativeMethods.CreateCompatibleDC(primaryHdc))
                    using (SafeGDIHandle fontHandle = new SafeGDIHandle(font.ToHfont(), true))
                        using (SafeGDIHandle dib = NativeMethods.CreateDib(bounds, primaryHdc, memoryHdc))
                        {
                            NativeMethods.SelectObject(memoryHdc, fontHandle);

                            System.Windows.Forms.VisualStyles.VisualStyleRenderer renderer = new System.Windows.Forms.VisualStyles.VisualStyleRenderer(System.Windows.Forms.VisualStyles.VisualStyleElement.Window.Caption.Active);
                            NativeMethods.RECT bounds2 = new NativeMethods.RECT(bounds);
                            NativeMethods.RECT rect;
                            NativeMethods.GetThemeTextExtent(renderer.Handle, memoryHdc, 0, 0, text, text.Length, (int)textFormat, ref bounds2, out rect);
                            return(new Size(rect.Right - rect.Left, rect.Bottom - rect.Top));
                        }
            }
            finally
            {
                dc.ReleaseHdc();
            }
        }
Ejemplo n.º 2
0
 public static extern IntPtr SelectObject(SafeDeviceHandle hDC, SafeGDIHandle hObject);