mirror of https://github.com/dahall/Vanara.git
Updated DisabledItemComboBox with better dispoal handling
dahall
parent
c856d06332
commit
c21f6e2329
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@ -1,7 +1,6 @@
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using System;
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using System.ComponentModel;
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using System.Drawing;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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using System.Windows.Forms.VisualStyles;
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using Vanara.Drawing;
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@ -14,9 +13,7 @@ using ComboBoxStyle = System.Windows.Forms.ComboBoxStyle;
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namespace Vanara.Windows.Forms
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{
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/// <summary>
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/// Interface that exposes an <c>Enabled</c> property for an item supplied to <see cref="DisabledItemComboBox"/>.
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/// </summary>
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/// <summary>Interface that exposes an <c>Enabled</c> property for an item supplied to <see cref="DisabledItemComboBox"/>.</summary>
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public interface IEnableable
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{
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/// <summary>Gets a value indicating whether an item is enabled.</summary>
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@ -24,68 +21,51 @@ namespace Vanara.Windows.Forms
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bool Enabled { get; }
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}
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/// <summary>
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/// A version of <see cref="ComboBox"/> that allows for disabled items.
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/// </summary>
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/// <summary>A version of <see cref="ComboBox"/> that allows for disabled items.</summary>
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[ToolboxBitmap(typeof(DisabledItemComboBox), "Control")]
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public class DisabledItemComboBox : ComboBox
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{
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private const TextFormatFlags tff = TextFormatFlags.Default | TextFormatFlags.VerticalCenter | TextFormatFlags.SingleLine | TextFormatFlags.NoPadding;
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private bool animationsNeedCleanup;
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private ComboBoxState currentState = ComboBoxState.Normal, newState = ComboBoxState.Normal;
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private ListBoxNativeWindow dropDownWindow;
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private readonly VisualStyleRenderer vsr;
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/// <summary>
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/// Initializes a new instance of the <see cref="DisabledItemComboBox"/> class.
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/// </summary>
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/// <summary>Initializes a new instance of the <see cref="DisabledItemComboBox"/> class.</summary>
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public DisabledItemComboBox()
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{
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SetStyle(/*ControlStyles.Opaque |*/ ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);
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DrawMode = DrawMode.OwnerDrawFixed;
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DropDownStyle = ComboBoxStyle.DropDownList;
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if ((Environment.OSVersion.Version.Major >= 6) && VisualStyleRenderer.IsSupported && Application.RenderWithVisualStyles)
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if (Environment.OSVersion.Version.Major >= 6 && VisualStyleRenderer.IsSupported && Application.RenderWithVisualStyles)
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vsr = new VisualStyleRenderer("COMBOBOX", 5, 0);
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}
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/// <summary>
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/// Gets or sets a value indicating whether your code or the operating system will handle drawing of elements in the list.
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/// </summary>
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/// <returns>One of the <see cref="T:System.Windows.Forms.DrawMode" /> enumeration values. The default is <see cref="F:System.Windows.Forms.DrawMode.Normal" />.</returns>
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/// <PermissionSet>
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/// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" />
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/// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// </PermissionSet>
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/// <returns>One of the <see cref="T:System.Windows.Forms.DrawMode"/> enumeration values. The default is <see cref="F:System.Windows.Forms.DrawMode.Normal"/>.</returns>
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/// <PermissionSet><IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/><IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/><IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence"/><IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/></PermissionSet>
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[DefaultValue(DrawMode.OwnerDrawFixed), Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
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public new DrawMode DrawMode
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{
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get => base.DrawMode; set => base.DrawMode = value;
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get => base.DrawMode;
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set => base.DrawMode = value;
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}
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/// <summary>
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/// Gets or sets a value specifying the style of the combo box.
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/// </summary>
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/// <returns>One of the <see cref="T:System.Windows.Forms.ComboBoxStyle" /> values. The default is DropDown.</returns>
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/// <PermissionSet>
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/// <IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// <IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence" />
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/// <IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
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/// </PermissionSet>
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/// <summary>Gets or sets a value specifying the style of the combo box.</summary>
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/// <returns>One of the <see cref="T:System.Windows.Forms.ComboBoxStyle"/> values. The default is DropDown.</returns>
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/// <PermissionSet><IPermission class="System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/><IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/><IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode, ControlEvidence"/><IPermission class="System.Diagnostics.PerformanceCounterPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true"/></PermissionSet>
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[DefaultValue(ComboBoxStyle.DropDownList), Browsable(false), EditorBrowsable(EditorBrowsableState.Never)]
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public new ComboBoxStyle DropDownStyle
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{
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get => base.DropDownStyle; set => base.DropDownStyle = value;
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get => base.DropDownStyle;
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set => base.DropDownStyle = value;
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}
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/// <summary>
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/// Gets or sets the state of the combobox.
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/// </summary>
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/// <value>
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/// The state.
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/// </value>
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/// <summary>Gets or sets the state of the combobox.</summary>
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/// <value>The state.</value>
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private ComboBoxState State
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{
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get => currentState;
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@ -95,28 +75,25 @@ namespace Vanara.Windows.Forms
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newState = value;
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if (diff)
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{
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if (animationsNeedCleanup && IsHandleCreated) BufferedPaintStopAllAnimations(Handle);
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if (animationsNeedCleanup && IsHandleCreated && !IsDisposed)
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BufferedPaintStopAllAnimations(Handle);
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Invalidate();
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}
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}
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}
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/// <summary>
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/// Determines whether an item is enabled.
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/// </summary>
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/// <summary>Determines whether an item is enabled.</summary>
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/// <param name="idx">The index of the item.</param>
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/// <returns>
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/// <c>true</c> if enabled; otherwise, <c>false</c>.
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/// </returns>
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/// <returns><c>true</c> if enabled; otherwise, <c>false</c>.</returns>
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public bool IsItemEnabled(int idx) => !(idx > -1 && idx < Items.Count && Items[idx] is IEnableable && !((IEnableable)Items[idx]).Enabled);
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/// <summary>
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/// Releases the unmanaged resources used by the <see cref="T:System.Windows.Forms.ComboBox" /> and optionally releases the managed resources.
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/// Releases the unmanaged resources used by the <see cref="T:System.Windows.Forms.ComboBox"/> and optionally releases the managed resources.
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/// </summary>
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/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
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protected override void Dispose(bool disposing)
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{
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if (animationsNeedCleanup)
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if (animationsNeedCleanup && !IsDisposed)
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{
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BufferedPaintUnInit();
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animationsNeedCleanup = false;
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@ -124,10 +101,8 @@ namespace Vanara.Windows.Forms
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base.Dispose(disposing);
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.ComboBox.DrawItem" /> event.
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/// </summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.DrawItemEventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.ComboBox.DrawItem"/> event.</summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.DrawItemEventArgs"/> that contains the event data.</param>
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protected override void OnDrawItem(DrawItemEventArgs e)
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{
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var itemString = e.Index >= 0 ? GetItemText(Items[e.Index]) : string.Empty;
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@ -153,51 +128,45 @@ namespace Vanara.Windows.Forms
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base.OnDrawItem(e);
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.ComboBox.DropDown" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.ComboBox.DropDown"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnDropDown(EventArgs e)
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{
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base.OnDropDown(e);
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State = ComboBoxState.Pressed;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.ComboBox.DropDownClosed" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.ComboBox.DropDownClosed"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnDropDownClosed(EventArgs e)
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{
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base.OnDropDownClosed(e);
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State = ComboBoxState.Normal;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.HandleCreated" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.HandleCreated"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnHandleCreated(EventArgs e)
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{
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base.OnHandleCreated(e);
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if (vsr != null)
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{
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BufferedPaintInit();
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animationsNeedCleanup = true;
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}
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.HandleDestroyed" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.HandleDestroyed"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnHandleDestroyed(EventArgs e)
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{
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dropDownWindow?.DestroyHandle();
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dropDownWindow?.ReleaseHandle();
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dropDownWindow = null;
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base.OnHandleDestroyed(e);
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.KeyPress" /> event.
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/// </summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.KeyPressEventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.KeyPress"/> event.</summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.KeyPressEventArgs"/> that contains the event data.</param>
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protected override void OnKeyPress(KeyPressEventArgs e)
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{
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var idx = FindEnabledString(e.KeyChar.ToString(), SelectedIndex);
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@ -206,40 +175,32 @@ namespace Vanara.Windows.Forms
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base.OnKeyPress(e);
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.LostFocus" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.LostFocus"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnLostFocus(EventArgs e)
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{
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base.OnLostFocus(e);
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Invalidate();
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.MouseDown" /> event.
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/// </summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.MouseEventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.MouseDown"/> event.</summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.MouseEventArgs"/> that contains the event data.</param>
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protected override void OnMouseDown(MouseEventArgs e)
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{
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base.OnMouseDown(e);
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State = ComboBoxState.Pressed;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.MouseEnter" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.MouseEnter"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnMouseEnter(EventArgs e)
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{
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base.OnMouseEnter(e);
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State = ComboBoxState.Hot;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.MouseLeave" /> event.
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/// </summary>
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/// <param name="e">An <see cref="T:System.EventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.MouseLeave"/> event.</summary>
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/// <param name="e">An <see cref="T:System.EventArgs"/> that contains the event data.</param>
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protected override void OnMouseLeave(EventArgs e)
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{
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base.OnMouseLeave(e);
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@ -247,10 +208,8 @@ namespace Vanara.Windows.Forms
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State = ComboBoxState.Normal;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.MouseMove" /> event.
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/// </summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.MouseEventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.MouseMove"/> event.</summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.MouseEventArgs"/> that contains the event data.</param>
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protected override void OnMouseMove(MouseEventArgs e)
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{
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base.OnMouseMove(e);
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@ -258,28 +217,26 @@ namespace Vanara.Windows.Forms
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State = ComboBoxState.Hot;
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}
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/// <summary>
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/// Raises the <see cref="E:System.Windows.Forms.Control.Paint" /> event.
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/// </summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.PaintEventArgs" /> that contains the event data.</param>
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/// <summary>Raises the <see cref="E:System.Windows.Forms.Control.Paint"/> event.</summary>
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/// <param name="e">A <see cref="T:System.Windows.Forms.PaintEventArgs"/> that contains the event data.</param>
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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BufferedPaint.PaintAnimation(e.Graphics, this, ClientRectangle, PaintControl, currentState, Enabled ? newState : ComboBoxState.Disabled, (a,b) => (int)vsr.GetTransitionDuration((int)a, (int)b));
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if (IsDisposed)
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return;
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BufferedPaint.PaintAnimation(e.Graphics, this, ClientRectangle, PaintControl, currentState, Enabled ? newState : ComboBoxState.Disabled, (a, b) => (int)vsr.GetTransitionDuration((int)a, (int)b));
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}
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/// <summary>
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/// Paints the background of the control.
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/// </summary>
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/// <param name="pevent">A <see cref="T:System.Windows.Forms.PaintEventArgs" /> that contains information about the control to paint.</param>
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/// <summary>Paints the background of the control.</summary>
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/// <param name="pevent">A <see cref="T:System.Windows.Forms.PaintEventArgs"/> that contains information about the control to paint.</param>
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protected override void OnPaintBackground(PaintEventArgs pevent)
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{
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// don't paint the control's background
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}
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/// <summary>
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/// Paints the control.
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/// </summary>
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/// <summary>Paints the control.</summary>
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/// <param name="dc">The dc.</param>
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/// <param name="bounds">The bounds.</param>
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/// <param name="state">State of the current.</param>
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@ -348,14 +305,12 @@ namespace Vanara.Windows.Forms
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}
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}
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/// <summary>
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/// Processes a command key.
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/// </summary>
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/// <param name="msg">A <see cref="T:System.Windows.Forms.Message" />, passed by reference, that represents the window message to process.</param>
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/// <param name="keyData">One of the <see cref="T:System.Windows.Forms.Keys" /> values that represents the key to process.</param>
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/// <returns>
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/// true if the character was processed by the control; otherwise, false.
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/// </returns>
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/// <summary>Processes a command key.</summary>
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/// <param name="msg">
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/// A <see cref="T:System.Windows.Forms.Message"/>, passed by reference, that represents the window message to process.
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/// </param>
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/// <param name="keyData">One of the <see cref="T:System.Windows.Forms.Keys"/> values that represents the key to process.</param>
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/// <returns>true if the character was processed by the control; otherwise, false.</returns>
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protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
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{
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var visItems = DropDownHeight / ItemHeight;
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@ -372,11 +327,17 @@ namespace Vanara.Windows.Forms
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return true;
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case Keys.PageDown:
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SelectedIndex = SelectedIndex + visItems > Items.Count ? GetNextEnabledItemIndex(Items.Count, false) : GetNextEnabledItemIndex(SelectedIndex + visItems, true);
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if (SelectedIndex + visItems > Items.Count)
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SelectedIndex = GetNextEnabledItemIndex(Items.Count, false);
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else
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SelectedIndex = GetNextEnabledItemIndex(SelectedIndex + visItems, true);
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||||
return true;
|
||||
|
||||
case Keys.PageUp:
|
||||
SelectedIndex = SelectedIndex - visItems < 0 ? GetNextEnabledItemIndex(-1, true) : GetNextEnabledItemIndex(SelectedIndex - visItems, false);
|
||||
if (SelectedIndex - visItems < 0)
|
||||
SelectedIndex = GetNextEnabledItemIndex(-1, true);
|
||||
else
|
||||
SelectedIndex = GetNextEnabledItemIndex(SelectedIndex - visItems, false);
|
||||
return true;
|
||||
|
||||
case Keys.Home:
|
||||
|
|
@ -388,8 +349,8 @@ namespace Vanara.Windows.Forms
|
|||
return true;
|
||||
|
||||
case Keys.Enter:
|
||||
var pt = dropDownWindow.MapPointToClient(Cursor.Position);
|
||||
var idx = dropDownWindow.IndexFromPoint(pt.X, pt.Y);
|
||||
var pt = dropDownWindow?.MapPointToClient(Cursor.Position) ?? default;
|
||||
var idx = dropDownWindow?.IndexFromPoint(pt.X, pt.Y) ?? default;
|
||||
if (idx >= 0 && IsItemEnabled(idx))
|
||||
return false;
|
||||
DroppedDown = false;
|
||||
|
|
@ -402,14 +363,12 @@ namespace Vanara.Windows.Forms
|
|||
return base.ProcessCmdKey(ref msg, keyData);
|
||||
}
|
||||
|
||||
/// <summary>
|
||||
/// Processes Windows messages.
|
||||
/// </summary>
|
||||
/// <param name="m">The Windows <see cref="T:System.Windows.Forms.Message" /> to process.</param>
|
||||
/// <summary>Processes Windows messages.</summary>
|
||||
/// <param name="m">The Windows <see cref="T:System.Windows.Forms.Message"/> to process.</param>
|
||||
protected override void WndProc(ref Message m)
|
||||
{
|
||||
base.WndProc(ref m);
|
||||
if ((int)(long)m.WParam == 0x3e80001)
|
||||
if ((int)(long)m.WParam == 0x3e80001 && !IsDisposed)
|
||||
{
|
||||
dropDownWindow = new ListBoxNativeWindow(m.LParam, this);
|
||||
}
|
||||
|
|
@ -419,7 +378,7 @@ namespace Vanara.Windows.Forms
|
|||
{
|
||||
if (str != null)
|
||||
{
|
||||
if ((startIndex < -1) || (startIndex >= Items.Count))
|
||||
if (startIndex < -1 || startIndex >= Items.Count)
|
||||
return -1;
|
||||
var length = str.Length;
|
||||
var num2 = 0;
|
||||
|
|
@ -475,7 +434,7 @@ namespace Vanara.Windows.Forms
|
|||
|
||||
protected override void WndProc(ref Message m)
|
||||
{
|
||||
if (m.Msg == 0x0202 || m.Msg == 0x0201 || m.Msg == 0x0203) /* WM_LBUTTONUP or WM_LBUTTONDOWN or WM_LBUTTONDBLCLK */
|
||||
if (!Parent.IsDisposed && m.Msg == 0x0202 || m.Msg == 0x0201 || m.Msg == 0x0203) /* WM_LBUTTONUP or WM_LBUTTONDOWN or WM_LBUTTONDBLCLK */
|
||||
{
|
||||
var idx = IndexFromPoint(SignedLOWORD(m.LParam), SignedHIWORD(m.LParam));
|
||||
if (idx >= 0 && !Parent.IsItemEnabled(idx))
|
||||
|
|
|
|||
Loading…
Reference in New Issue