ResizeGrip.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / Activities / Core / Presentation / ResizeGrip.cs / 1305376 / ResizeGrip.cs
                        

                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------
namespace System.Activities.Core.Presentation
{ 
    using System.Windows;
    using System.Windows.Controls; 
    using System.Windows.Input; 
    using System.Windows.Media;
    using System.Runtime; 
    using System.Activities.Presentation.Model;
    using System.Activities.Presentation;
    using System.ComponentModel;
 
    //This class is visual representation of ResizeGrip like control, which is used in a Grid to allow resizing.
    class ResizeGrip : Control 
    { 
        public static readonly DependencyProperty IconProperty =
            DependencyProperty.Register("Icon", typeof(DrawingBrush), typeof(ResizeGrip)); 

        public static readonly DependencyProperty ParentFlowchartDesignerProperty =
            DependencyProperty.Register("ParentFlowchartDesigner", typeof(FlowchartDesigner), typeof(ResizeGrip));
 
        public static readonly DependencyProperty ParentGridProperty =
            DependencyProperty.Register("ParentGrid", typeof(Grid), typeof(ResizeGrip)); 
 
        public static readonly DependencyProperty DisabledProperty =
            DependencyProperty.Register("Disabled", typeof(bool), typeof(ResizeGrip), new UIPropertyMetadata(false)); 

        Point offset;

        public DrawingBrush Icon 
        {
            get { return (DrawingBrush)GetValue(IconProperty); } 
            set { SetValue(IconProperty, value); } 
        }
 
        public FlowchartDesigner ParentFlowchartDesigner
        {
            get { return (FlowchartDesigner)GetValue(ParentFlowchartDesignerProperty); }
            set { SetValue(ParentFlowchartDesignerProperty, value); } 
        }
 
        public Grid ParentGrid 
        {
            get { return (Grid)GetValue(ParentGridProperty); } 
            set { SetValue(ParentGridProperty, value); }
        }

        public bool Disabled 
        {
            get { return (bool)GetValue(DisabledProperty); } 
            set { SetValue(DisabledProperty, value); } 
        }
 
        protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
        {
            if (!this.Disabled)
            { 
                this.Cursor = Cursors.SizeNWSE;
                this.offset = e.GetPosition(this); 
                this.CaptureMouse(); 
                e.Handled = true;
            } 
            base.OnPreviewMouseLeftButtonDown(e);
        }

        protected override void OnMouseMove(MouseEventArgs args) 
        {
            base.OnMouseMove(args); 
            if (!this.Disabled) 
            {
                if (args.LeftButton == MouseButtonState.Pressed && this.IsMouseCaptured) 
                {
                    FlowchartDesigner flowchartDesigner = this.ParentFlowchartDesigner;
                    FreeFormPanel panel = flowchartDesigner.panel;
                    Grid flowchartGrid = this.ParentGrid; 
                    Point currentPosition = Mouse.GetPosition(flowchartGrid);
 
                    currentPosition.Offset(this.offset.X, this.offset.Y); 

                    flowchartDesigner.FlowchartWidth = Math.Min(Math.Max(panel.RequiredWidth, currentPosition.X), flowchartGrid.MaxWidth); 
                    flowchartDesigner.FlowchartHeight = Math.Min(Math.Max(panel.RequiredHeight, currentPosition.Y), flowchartGrid.MaxHeight);
                }
            }
        } 

        protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e) 
        { 
            if (!this.Disabled)
            { 
                FlowchartDesigner flowchartDesigner = this.ParentFlowchartDesigner;
                ModelItem flowchartModelItem = this.ParentFlowchartDesigner.ModelItem;
                using (ModelEditingScope scope = flowchartModelItem.BeginEdit(SR.FCResizeUndoUnitName))
                { 
                    TypeDescriptor.GetProperties(flowchartModelItem)[FlowchartSizeFeature.WidthPropertyName].SetValue(flowchartModelItem, flowchartDesigner.FlowchartWidth);
                    TypeDescriptor.GetProperties(flowchartModelItem)[FlowchartSizeFeature.HeightPropertyName].SetValue(flowchartModelItem, flowchartDesigner.FlowchartHeight); 
                    scope.Complete(); 
                }
                Mouse.OverrideCursor = null; 
                Mouse.Capture(null);
                e.Handled = true;
            }
            base.OnPreviewMouseLeftButtonUp(e); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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