294 lines
8.0 KiB
C#
294 lines
8.0 KiB
C#
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// Copyright (c) 2005 Novell, Inc.
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//
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// Authors:
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// Jackson Harper (jackson@ximian.com)
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using System;
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using System.Drawing;
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namespace System.Windows.Forms {
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internal class SizeGrip : Control {
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#region Local Variables
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private Point capture_point;
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private Control captured_control;
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private int window_w;
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private int window_h;
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private bool hide_pending;
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private bool captured;
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private bool is_virtual; // If virtual the size grip is painted directly on the captured controls' surface.
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private bool enabled;
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private bool fill_background;
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private Rectangle last_painted_area; // The last area that was painted (to know which area to invalidate when resizing).
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#endregion // Local Variables
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#region Constructors
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public SizeGrip (Control CapturedControl)
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{
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this.Cursor = Cursors.SizeNWSE;
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enabled = true;
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fill_background = true;
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this.Size = GetDefaultSize ();
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this.CapturedControl = CapturedControl;
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}
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#endregion // Constructors
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#region Properties
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public bool FillBackground {
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get {
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return fill_background;
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}
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set {
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fill_background = value;
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}
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}
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public bool Virtual {
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get {
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return is_virtual;
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}
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set {
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if (is_virtual == value)
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return;
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is_virtual = value;
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if (is_virtual) {
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CapturedControl.MouseMove += new MouseEventHandler(HandleMouseMove);
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CapturedControl.MouseUp += new MouseEventHandler(HandleMouseUp);
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CapturedControl.MouseDown += new MouseEventHandler(HandleMouseDown);
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CapturedControl.EnabledChanged += new EventHandler(HandleEnabledChanged);
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CapturedControl.Resize += new EventHandler(HandleResize);
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} else {
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CapturedControl.MouseMove -= new MouseEventHandler (HandleMouseMove);
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CapturedControl.MouseUp -= new MouseEventHandler (HandleMouseUp);
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CapturedControl.MouseDown -= new MouseEventHandler (HandleMouseDown);
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CapturedControl.EnabledChanged -= new EventHandler (HandleEnabledChanged);
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CapturedControl.Resize -= new EventHandler (HandleResize);
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}
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}
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}
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public Control CapturedControl {
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get {
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return captured_control;
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}
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set {
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captured_control = value;
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}
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}
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#endregion // Properties
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#region Methods
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static internal Size GetDefaultSize () {
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return new Size (SystemInformation.VerticalScrollBarWidth, SystemInformation.HorizontalScrollBarHeight);
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}
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static internal Rectangle GetDefaultRectangle (Control Parent)
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{
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Size size = GetDefaultSize ();
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return new Rectangle (Parent.ClientSize.Width - size.Width, Parent.ClientSize.Height - size.Height, size.Width, size.Height);
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}
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private void HandleResize (object sender, EventArgs e)
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{
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Control ctrl = (Control) sender;
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ctrl.Invalidate (last_painted_area);
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}
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private void HandleEnabledChanged (object sender, EventArgs e)
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{
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Control ctrl = (Control) sender;
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enabled = ctrl.Enabled;
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Cursor cursor;
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if (enabled) {
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cursor = Cursors.SizeNWSE;
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} else {
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cursor = Cursors.Default;
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}
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if (is_virtual) {
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if (CapturedControl != null)
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CapturedControl.Cursor = cursor;
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} else {
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this.Cursor = cursor;
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}
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ctrl.Invalidate (GetDefaultRectangle (ctrl));
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}
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// This method needs to be internal, since the captured control must be able to call
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// it. We can't use events to hook it up, since then the paint ordering won't be correct
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internal void HandlePaint (object sender, PaintEventArgs e)
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{
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if (Visible) {
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Control destination = (Control) sender;
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Graphics gr = e.Graphics;
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Rectangle rect = GetDefaultRectangle (destination);
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if (!is_virtual || fill_background) {
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gr.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (ThemeEngine.Current.ColorControl), rect);
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}
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if (enabled) {
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ControlPaint.DrawSizeGrip (gr, BackColor, rect);
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}
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last_painted_area = rect;
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}
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}
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private void HandleMouseCaptureChanged (object sender, EventArgs e)
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{
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Control ctrl = (Control) sender;
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if (captured && !ctrl.Capture) {
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captured = false;
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CapturedControl.Size = new Size (window_w, window_h);
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}
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}
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internal void HandleMouseDown (object sender, MouseEventArgs e)
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{
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if (enabled) {
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Control ctrl = (Control)sender;
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if (!GetDefaultRectangle (ctrl).Contains (e.X, e.Y)) {
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return;
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}
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ctrl.Capture = true;
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captured = true;
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capture_point = Control.MousePosition;
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window_w = CapturedControl.Width;
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window_h = CapturedControl.Height;
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}
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}
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internal void HandleMouseMove (object sender, MouseEventArgs e)
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{
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Control ctrl = (Control) sender;
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Rectangle rect = GetDefaultRectangle (ctrl);
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if (rect.Contains (e.X, e.Y)) {
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ctrl.Cursor = Cursors.SizeNWSE;
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} else {
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ctrl.Cursor = Cursors.Default;
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}
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if (captured) {
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int delta_x;
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int delta_y;
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Point current_point;
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current_point = Control.MousePosition;
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delta_x = current_point.X - capture_point.X;
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delta_y = current_point.Y - capture_point.Y;
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Control parent = CapturedControl;
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Form form_parent = parent as Form;
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Size new_size = new Size (window_w + delta_x, window_h + delta_y);
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Size max_size = form_parent != null ? form_parent.MaximumSize : Size.Empty;
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Size min_size = form_parent != null ? form_parent.MinimumSize : Size.Empty;
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if (new_size.Width > max_size.Width && max_size.Width > 0)
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new_size.Width = max_size.Width;
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else if (new_size.Width < min_size.Width)
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new_size.Width = min_size.Width;
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if (new_size.Height > max_size.Height && max_size.Height > 0)
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new_size.Height = max_size.Height;
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else if (new_size.Height < min_size.Height)
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new_size.Height = min_size.Height;
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if (new_size != parent.Size) {
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parent.Size = new_size;
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}
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}
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}
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internal void HandleMouseUp (object sender, MouseEventArgs e)
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{
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if (captured) {
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Control ctrl = (Control) sender;
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captured = false;
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ctrl.Capture = false;
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ctrl.Invalidate (last_painted_area);
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if (Parent is ScrollableControl) {
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((ScrollableControl)Parent).UpdateSizeGripVisible ();
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}
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if (hide_pending) {
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Hide();
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hide_pending = false;
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}
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}
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}
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protected override void SetVisibleCore(bool value) {
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if (Capture) {
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if (value == false) {
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hide_pending = true;
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} else {
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hide_pending = false;
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}
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return;
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}
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base.SetVisibleCore (value);
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}
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protected override void OnPaint (PaintEventArgs pe)
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{
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HandlePaint (this, pe);
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base.OnPaint (pe);
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}
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protected override void OnMouseCaptureChanged (EventArgs e)
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{
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base.OnMouseCaptureChanged (e);
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HandleMouseCaptureChanged (this, e);
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}
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protected override void OnEnabledChanged (EventArgs e)
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{
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base.OnEnabledChanged (e);
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HandleEnabledChanged (this, e);
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}
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protected override void OnMouseDown (MouseEventArgs e)
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{
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HandleMouseDown (this, e);
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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HandleMouseMove (this, e);
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}
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protected override void OnMouseUp (MouseEventArgs e)
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{
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HandleMouseUp (this, e);
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}
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#endregion // Methods
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}
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}
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