ToolStripPanelCell.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ToolStripPanelCell.cs / 1 / ToolStripPanelCell.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
    using System.Drawing; 
    using System.Windows.Forms.Layout;
    using System.Collections.Specialized; 
    using System.Collections;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Globalization; 

 
 
    /// this class is a container for toolstrips on a rafting row.
    /// you can set layout styles on this container all day long and not 
    /// affect the underlying toolstrip's properties.... so if its
    /// removed from a rafting container its still got its defaults
    /// set up for it.
    internal class ToolStripPanelCell : ArrangedElement { 

 
        private ToolStrip _wrappedToolStrip  = null; 
        private ToolStripPanelRow parent       = null;
        private Size maxSize            = LayoutUtils.MaxSize; 
        private bool currentlySizing    = false;
        private bool currentlyDragging   = false;
        private bool restoreOnVisibleChanged = false;
 
        private Rectangle cachedBounds = Rectangle.Empty;
#if DEBUG 
        private string cellID; 
        [ThreadStatic]
        private static int cellCount; 
#endif

        public ToolStripPanelCell(Control control):this(null, control) {
 
        }
        public ToolStripPanelCell(ToolStripPanelRow parent, Control control) { 
 
#if DEBUG
 
            // Ensure 1:1 Cell/ToolStripPanel mapping
            cellID = string.Format(CultureInfo.CurrentCulture, "{0}.{1}", control.Name, ++cellCount);
            Debug.Assert(cellCount <= ToolStripManager.ToolStrips.Count, "who is allocating an extra toolstrippanel cell?");
#endif 

            this.ToolStripPanelRow = parent; 
            this._wrappedToolStrip = control as ToolStrip; 
            if (control == null) {
                throw new ArgumentNullException("control"); 
            }
            else if (_wrappedToolStrip == null) {
               throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.TypedControlCollectionShouldBeOfType, typeof(ToolStrip).Name)), control.GetType().Name);
            } 
            CommonProperties.SetAutoSize(this, true);
             _wrappedToolStrip.LocationChanging += new ToolStripLocationCancelEventHandler(this.OnToolStripLocationChanging); 
             _wrappedToolStrip.VisibleChanged += new EventHandler(this.OnToolStripVisibleChanged); 

        } 

        public Rectangle CachedBounds {
            get { return cachedBounds; }
            set { cachedBounds = value; 
                Debug.Assert(cachedBounds.X >= 0 &&  cachedBounds.Y >= 0, "cached bounds are outside of the client area, investigate");
            } 
        } 

 
        public Control Control {
            get { return _wrappedToolStrip; }
        }
 
        // ToolStripPanelCell is considered to be Visible if the wrapped control is InDesignMode.
        // This property is accessed from the ToolStripPanelRow in cases where we are moving the toolStrip around 
        // during a drag operation. 
        public bool ControlInDesignMode {
            get { return (_wrappedToolStrip != null && _wrappedToolStrip.IsInDesignMode); } 
        }

        public IArrangedElement InnerElement {
            get { return _wrappedToolStrip as IArrangedElement; } 
        }
 
        public ISupportToolStripPanel DraggedControl { 
            get { return _wrappedToolStrip as ISupportToolStripPanel; }
        } 


        public ToolStripPanelRow ToolStripPanelRow {
            get { return parent; } 
            set {
                if (parent != value) { 
                    if (parent != null) { 
                        ((IList)parent.Cells).Remove(this);
                    } 
                    parent = value;
                    this.Margin = Padding.Empty;

                } 

            } 
        } 

        public override bool Visible { 
            get {
                if (Control != null && Control.ParentInternal == ToolStripPanelRow.ToolStripPanel) {
                    return InnerElement.ParticipatesInLayout;
                } 
                return false;
            } 
            set { 
                Control.Visible = value;
            } 
        }

        public Size MaximumSize {
            get { return maxSize; } 
        }
 
 
        public override LayoutEngine LayoutEngine {
            get { return DefaultLayout.Instance; } 
        }

        protected override IArrangedElement GetContainer() {
            return parent; 
        }
 
        public int Grow(int growBy) { 
           if (ToolStripPanelRow.Orientation == Orientation.Vertical) {
                return GrowVertical(growBy); 
            }
            else {
                return GrowHorizontal(growBy);
            } 

 
        } 

        private int GrowVertical(int growBy) { 
            // Grow         ---]
            // Pref [      ]
            // Max  [      ]
            if (MaximumSize.Height >= Control.PreferredSize.Height) { 
                // nothing to grow.
                return 0; 
            } 

            // Grow         ---] 
            // Pref [        ]
            // Max  [      ]
            if (MaximumSize.Height + growBy >= Control.PreferredSize.Height) {
                 int freed = Control.PreferredSize.Height - MaximumSize.Height; 
                 maxSize=LayoutUtils.MaxSize;
                 return freed; 
            } 

            // Grow         ---] 
            // Pref [            ]
            // Max  [      ]
            if (MaximumSize.Height + growBy < Control.PreferredSize.Height) {
                 maxSize.Height += growBy; 
                 return growBy;
            } 
            return 0; 

        } 

        private int GrowHorizontal(int growBy) {

            // Grow         ---] 
            // Pref [      ]
            // Max  [      ] 
            if (MaximumSize.Width >= Control.PreferredSize.Width) { 
                // nothing to grow.
                return 0; 
            }

            // Grow         ---]
            // Pref [        ] 
            // Max  [      ]
            if (MaximumSize.Width + growBy >= Control.PreferredSize.Width) { 
                 int freed = Control.PreferredSize.Width - MaximumSize.Width; 
                 maxSize=LayoutUtils.MaxSize;
                 return freed; 
            }

            // Grow         ---]
            // Pref [            ] 
            // Max  [      ]
            if (MaximumSize.Width + growBy < Control.PreferredSize.Width) { 
                 maxSize.Width += growBy; 
                 return growBy;
            } 
            return 0;

        }
        protected override void Dispose(bool disposing) { 
            try {
                if (disposing) { 
                    if (_wrappedToolStrip != null) { 
#if DEBUG
                        cellCount--; 
#endif
                        _wrappedToolStrip.LocationChanging -= new ToolStripLocationCancelEventHandler(this.OnToolStripLocationChanging);
                        _wrappedToolStrip.VisibleChanged -= new EventHandler(this.OnToolStripVisibleChanged);
                    } 
                    _wrappedToolStrip = null;
                    if (parent != null) { 
                        ((IList)parent.Cells).Remove(this); 
                    }
                    parent = null; 
                }
#if DEBUG
                else {
                    cellCount--; 
                }
#endif 
 
            }
            finally { 
                base.Dispose(disposing);
            }
        }
 
        protected override ArrangedElementCollection GetChildren() {
            return ArrangedElementCollection.Empty; 
        } 

        public override Size GetPreferredSize(Size constrainingSize) { 
            ISupportToolStripPanel draggedControl = DraggedControl;
            Size preferredSize = Size.Empty;

            if (draggedControl.Stretch) { 
                if (ToolStripPanelRow.Orientation == Orientation.Horizontal) {
                   constrainingSize.Width = ToolStripPanelRow.Bounds.Width; 
                   preferredSize = _wrappedToolStrip.GetPreferredSize(constrainingSize); 
                   preferredSize.Width = constrainingSize.Width;
                } 
                else {
                    constrainingSize.Height = ToolStripPanelRow.Bounds.Height;
                    preferredSize = _wrappedToolStrip.GetPreferredSize(constrainingSize);
                    preferredSize.Height = constrainingSize.Height; 
                }
            } 
            else { 
                preferredSize = (!_wrappedToolStrip.AutoSize) ? _wrappedToolStrip.Size : _wrappedToolStrip.GetPreferredSize(constrainingSize);
            } 


           // return LayoutUtils.IntersectSizes(constrainingSize, preferredSize);
            return preferredSize; 
        }
 
        protected override void SetBoundsCore(Rectangle bounds, BoundsSpecified specified) { 

            currentlySizing = true; 
            this.CachedBounds = bounds;
            try
            {
                if (DraggedControl.IsCurrentlyDragging) { 
                    if (ToolStripPanelRow.Cells[ToolStripPanelRow.Cells.Count -1] == this) {
                        Rectangle displayRectangle = ToolStripPanelRow.DisplayRectangle; 
                        if (ToolStripPanelRow.Orientation == Orientation.Horizontal) { 
                            int spaceToFree = bounds.Right - displayRectangle.Right;
                            if (spaceToFree > 0 && bounds.Width > spaceToFree) { 
                                bounds.Width -= spaceToFree;
                            }
                        }
                        else { 
                            int spaceToFree = bounds.Bottom - displayRectangle.Bottom;
                            if (spaceToFree > 0 && bounds.Height > spaceToFree) { 
                                bounds.Height -= spaceToFree; 
                            }
                        } 
                    }
                    Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelMouseDebug.TraceVerbose, "[CELL] DRAGGING calling SetBounds " + bounds.ToString());
                    base.SetBoundsCore(bounds,specified);
                    InnerElement.SetBounds(bounds, specified); 
                }
                else { 
                   if (!ToolStripPanelRow.CachedBoundsMode) { 
                        Debug.WriteLineIf(ToolStripPanelRow.ToolStripPanelMouseDebug.TraceVerbose, "[CELL] NOT DRAGGING calling SetBounds " + bounds.ToString());
                        base.SetBoundsCore(bounds,specified); 
                        InnerElement.SetBounds(bounds, specified);

                   }
 
                }
 
            } 
            finally
            { 
                currentlySizing = false;
            }
        }
 
        public int Shrink(int shrinkBy) {
            if (ToolStripPanelRow.Orientation == Orientation.Vertical) { 
                return ShrinkVertical(shrinkBy); 
            }
            else { 
                return ShrinkHorizontal(shrinkBy);
            }
        }
 
        private int ShrinkHorizontal(int shrinkBy) {
            return 0; 
        } 

        private int ShrinkVertical(int shrinkBy) { 
            return 0;
        }

        ///  
        ///  New EventHandler for The LocationChanging so that ToolStripPanelCell Listens to the Location Property on the ToolStrips's being changed.
        ///  The ToolStrip needs to Raft (Join) to the approriate Location Depending on the new Location w.r.t to the oldLocation ... 
        ///  Hence the need for this event listener. 
        /// 
        private void OnToolStripLocationChanging(object sender, ToolStripLocationCancelEventArgs e) 
        {
            if (ToolStripPanelRow == null) {
                return;
            } 
            if (!currentlySizing && !currentlyDragging) {
                try { 
                    currentlyDragging = true; 
                    Point newloc = e.NewLocation;
                    // detect if we havent yet performed a layout - force one so we can 
                    // properly join to the row.
 					if (ToolStripPanelRow != null && ToolStripPanelRow.Bounds == Rectangle.Empty) {
						ToolStripPanelRow.ToolStripPanel.PerformUpdate(true);
                    } 
                    if (_wrappedToolStrip != null) {
                        ToolStripPanelRow.ToolStripPanel.Join(_wrappedToolStrip, newloc); 
                    } 
                }
                finally { 
                    currentlyDragging = false;
                    e.Cancel = true;
                }
            } 
        }
 
        private void OnToolStripVisibleChanged(object sender, EventArgs e) { 

            if (_wrappedToolStrip != null 
                && !_wrappedToolStrip.IsInDesignMode 

                && !_wrappedToolStrip.IsCurrentlyDragging
                && !_wrappedToolStrip.IsDisposed      // ensure we have a live-runtime only toolstrip.
                && !_wrappedToolStrip.Disposing) { 

                // VSWhidbey 395502 - rejoin the row when visibility is toggled. 
                // we dont want to do this logic at DT, as the DropSourceBehavior 
                // will set the toolstrip visible = false.
                if (!Control.Visible) { 
                    // if we are becoming visible = false, remember if we were in a toolstrippanelrow at the time.
                    restoreOnVisibleChanged = (ToolStripPanelRow != null && ((IList)ToolStripPanelRow.Cells).Contains(this));
                }
                else if (restoreOnVisibleChanged) { 
                    try {
                        // if we are becoming visible = true, and we ARE in a toolstrippanelrow, rejoin. 
                        if (ToolStripPanelRow != null && ((IList)ToolStripPanelRow.Cells).Contains(this)) { 
                            ToolStripPanelRow.ToolStripPanel.Join(_wrappedToolStrip, _wrappedToolStrip.Location);
                        } 
                    }
                    finally {
                        restoreOnVisibleChanged = false;
                    } 
                }
            } 
        } 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ToolStripPanelCell.cs source code in C# .NET

Source code for the .NET framework in C#

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