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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / WinForms / System / WinForms / Design / ComboBoxDesigner.cs / 1 / ComboBoxDesigner.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Windows.Forms.Design.ComboBoxDesigner..ctor()")] namespace System.Windows.Forms.Design { using System; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design; using System.Windows.Forms.Design.Behavior; ////// /// internal class ComboBoxDesigner : ControlDesigner { private EventHandler propChanged = null; // Delegate used to dirty the selectionUIItem when needed. private DesignerActionListCollection _actionLists; ////// Provides a designer that can design components /// that extend ComboBox. ////// /// Adds a baseline SnapLine to the list of SnapLines related /// to this control. /// public override IList SnapLines { get { ArrayList snapLines = base.SnapLines as ArrayList; //a single text-baseline for the label (and linklabel) control int baseline = DesignerUtils.GetTextBaseline(Control, System.Drawing.ContentAlignment.TopLeft); baseline += 3; snapLines.Add(new SnapLine(SnapLineType.Baseline, baseline, SnapLinePriority.Medium)); return snapLines; } } ////// /// Disposes of this object. /// protected override void Dispose(bool disposing) { if (disposing) { // Hook up the property change notification so that we can dirty the SelectionUIItem when needed. if (propChanged != null) { ((ComboBox)Control).StyleChanged -= propChanged; } } base.Dispose(disposing); } ////// /// Called by the host when we're first initialized. /// public override void Initialize(IComponent component) { base.Initialize(component); AutoResizeHandles = true; // Hook up the property change notification so that we can dirty the SelectionUIItem when needed. propChanged = new EventHandler(this.OnControlPropertyChanged); ((ComboBox)Control).StyleChanged += propChanged; } ////// /// We override this so we can clear the text field set by controldesigner. /// public override void InitializeNewComponent(IDictionary defaultValues) { base.InitializeNewComponent(defaultValues); // in Whidbey, formattingEnabled is TRUE ((ComboBox) this.Component).FormattingEnabled = true; PropertyDescriptor textProp = TypeDescriptor.GetProperties(Component)["Text"]; if (textProp != null && textProp.PropertyType == typeof(string) && !textProp.IsReadOnly && textProp.IsBrowsable) { textProp.SetValue(Component, ""); } } ////// /// For controls, we sync their property changed event so our component can track their location. /// private void OnControlPropertyChanged(object sender, EventArgs e) { if (BehaviorService != null) { BehaviorService.SyncSelection(); } } ////// /// Retrieves a set of rules concerning the movement capabilities of a component. /// This should be one or more flags from the SelectionRules class. If no designer /// provides rules for a component, the component will not get any UI services. /// public override SelectionRules SelectionRules { get { SelectionRules rules = base.SelectionRules; object component = Component; PropertyDescriptor propStyle = TypeDescriptor.GetProperties(component)["DropDownStyle"]; if (propStyle != null) { ComboBoxStyle style = (ComboBoxStyle)propStyle.GetValue(component); // Height is not user-changable for these styles if (style == ComboBoxStyle.DropDown || style == ComboBoxStyle.DropDownList) rules &= ~(SelectionRules.TopSizeable | SelectionRules.BottomSizeable); } return rules; } } public override DesignerActionListCollection ActionLists { get { if (_actionLists == null) { _actionLists = new DesignerActionListCollection(); _actionLists.Add(new ListControlBoundActionList(this)); } return _actionLists; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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