Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ButtonInternal / ButtonStandardAdapter.cs / 1 / ButtonStandardAdapter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms.ButtonInternal { using System; using System.Diagnostics; using System.Drawing; using System.Windows.Forms.Internal; using System.Drawing.Drawing2D; using System.Drawing.Imaging; using System.Drawing.Text; using System.Windows.Forms; using System.Windows.Forms.Layout; using System.Windows.Forms.VisualStyles; using System.Runtime.InteropServices; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; internal class ButtonStandardAdapter : ButtonBaseAdapter { private const int borderWidth = 2; internal ButtonStandardAdapter(ButtonBase control) : base(control) {} private PushButtonState DetermineState(bool up) { PushButtonState state = PushButtonState.Normal; if (!up) { state = PushButtonState.Pressed; } else if (Control.MouseIsOver) { state = PushButtonState.Hot; } else if (!Control.Enabled) { state = PushButtonState.Disabled; } else if (Control.Focused || Control.IsDefault) { state = PushButtonState.Default; } return state; } internal override void PaintUp(PaintEventArgs e, CheckState state) { PaintWorker(e, true, state); } internal override void PaintDown(PaintEventArgs e, CheckState state) { PaintWorker(e, false, state); } internal override void PaintOver(PaintEventArgs e, CheckState state) { PaintUp(e, state); } private void PaintThemedButtonBackground(PaintEventArgs e, Rectangle bounds, bool up) { PushButtonState pbState = DetermineState(up); // First handle transparent case if (ButtonRenderer.IsBackgroundPartiallyTransparent(pbState)) { ButtonRenderer.DrawParentBackground(e.Graphics, bounds, Control); } // Now draw the actual themed background ButtonRenderer.DrawButton(e.Graphics, Control.ClientRectangle, false, pbState); // Now overlay the background image or backcolor (the former overrides the latter), leaving a // margin. We hardcode this margin for now since GetThemeMargins returns 0 all the // time. //HACK We need to see what's best here. changing this to HACK because GetThemeMargins simply does not // work in some cases. bounds.Inflate(-buttonBorderSize, -buttonBorderSize); //only paint if the user said not to use the themed backcolor. if (!Control.UseVisualStyleBackColor) { bool painted = false; Color color = Control.BackColor; // Note: PaintEvent.HDC == 0 if GDI+ has used the HDC -- it wouldn't be safe for us // to use it without enough bookkeeping to negate any performance gain of using GDI. if (color.A == 255 && e.HDC != IntPtr.Zero) { if (DisplayInformation.BitsPerPixel > 8) { NativeMethods.RECT r = new NativeMethods.RECT(bounds.X, bounds.Y, bounds.Right, bounds.Bottom); SafeNativeMethods.FillRect(new HandleRef(e, e.HDC), ref r, new HandleRef(this, Control.BackColorBrush)); painted = true; } } if (!painted) { // don't paint anything from 100% transparent background // if (color.A > 0) { if (color.A == 255) { color = e.Graphics.GetNearestColor(color); } // Color has some transparency or we have no HDC, so we must // fall back to using GDI+. // using (Brush brush = new SolidBrush(color)) { e.Graphics.FillRectangle(brush, bounds); } } } } //This code is mostly taken from the non-themed rendering code path. if (Control.BackgroundImage != null && !DisplayInformation.HighContrast) { ControlPaint.DrawBackgroundImage(e.Graphics, Control.BackgroundImage, Color.Transparent, Control.BackgroundImageLayout, Control.ClientRectangle, bounds, Control.DisplayRectangle.Location, Control.RightToLeft); } } void PaintWorker(PaintEventArgs e, bool up, CheckState state) { up = up && state == CheckState.Unchecked; ColorData colors = PaintRender(e.Graphics).Calculate(); LayoutData layout; if (Application.RenderWithVisualStyles) { //don't have the text-pressed-down effect when we use themed painting //this is for consistency with win32 app. layout = PaintLayout(e, true).Layout(); } else { layout = PaintLayout(e, up).Layout(); } Graphics g = e.Graphics; Button thisbutton = this.Control as Button; if (Application.RenderWithVisualStyles) { PaintThemedButtonBackground(e, Control.ClientRectangle, up); } else { Brush backbrush = null; if (state == CheckState.Indeterminate) { backbrush = CreateDitherBrush(colors.highlight, colors.buttonFace); } try { Rectangle bounds = Control.ClientRectangle; if (up) { // We are going to draw a 2 pixel border bounds.Inflate(-borderWidth, -borderWidth); // VS Whidbey #459900 } else { // We are going to draw a 1 pixel border. bounds.Inflate(-1, -1); // VS Whidbey #503487 } PaintButtonBackground(e, bounds, backbrush); } finally { if (backbrush != null) { backbrush.Dispose(); backbrush = null; } } } PaintImage(e, layout); //inflate the focus rectangle to be consistent with the behavior of Win32 app if (Application.RenderWithVisualStyles) { layout.focus.Inflate(1, 1); } PaintField(e, layout, colors, colors.windowText, true); if (!Application.RenderWithVisualStyles) { Rectangle r = Control.ClientRectangle; if (Control.IsDefault) { r.Inflate(-1, -1); } DrawDefaultBorder(g, r, colors.windowFrame, this.Control.IsDefault); if (up) { Draw3DBorder(g, r, colors, up); } else { // contrary to popular belief, not Draw3DBorder(..., false); // ControlPaint.DrawBorder(g, r, colors.buttonShadow, ButtonBorderStyle.Solid); } } } #region Layout protected override LayoutOptions Layout(PaintEventArgs e) { LayoutOptions layout = PaintLayout(e, /* up = */ false); Debug.Assert(layout.GetPreferredSizeCore(LayoutUtils.MaxSize) == PaintLayout(e, /* up = */ true).GetPreferredSizeCore(LayoutUtils.MaxSize), "The state of up should not effect PreferredSize"); return layout; } [SuppressMessage("Microsoft.Performance", "CA1801:AvoidUnusedParameters")] // removed graphics, may have to put it back private LayoutOptions PaintLayout(PaintEventArgs e, bool up) { LayoutOptions layout = CommonLayout(); layout.textOffset = !up; layout.everettButtonCompat = !Application.RenderWithVisualStyles; return layout; } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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