// Copyright © 2015 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.Windows.Forms;
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namespace CefSharp.WinForms.Internals
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{
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/// <summary>
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/// ControlExtensions.
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/// </summary>
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public static class ControlExtensions
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{
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/// <summary>
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/// Executes the Action asynchronously on the UI thread, does not block execution on the calling thread.
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/// No action will be performed if the control doesn't have a valid handle or the control is Disposed/Disposing.
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/// </summary>
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/// <param name="control">the control for which the update is required</param>
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/// <param name="action">action to be performed on the control</param>
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internal static void InvokeOnUiThreadIfRequired(this Control control, Action action)
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{
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//No action
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if (control.Disposing || control.IsDisposed || !control.IsHandleCreated)
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{
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return;
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}
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if (control.InvokeRequired)
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{
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control.BeginInvoke((Action)(() =>
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{
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//No action
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if (control.Disposing || control.IsDisposed || !control.IsHandleCreated)
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{
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return;
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}
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action();
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}));
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}
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else
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{
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action.Invoke();
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}
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}
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/// <summary>
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/// Executes the Action sync on the UI thread, blocks execution on the calling thread.
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/// No action will be performed if the control doesn't have a valid handle or the control is Disposed/Disposing.
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/// </summary>
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/// <param name="control">the control for which the update is required</param>
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/// <param name="action">action to be performed on the control</param>
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internal static void InvokeSyncOnUiThreadIfRequired(this Control control, Action action)
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{
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//No action
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if (control.Disposing || control.IsDisposed || !control.IsHandleCreated)
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{
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return;
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}
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if (control.InvokeRequired)
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{
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control.Invoke(action);
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}
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else
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{
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action();
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}
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}
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/// <summary>
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/// Activates the specified control.
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/// </summary>
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/// <param name="control">The control.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise.</returns>
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public static bool Activate(this Control control)
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{
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// Notify WinForms world that inner browser window got focus. This will trigger Leave event to previous focused control
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var containerControl = control.GetContainerControl();
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if (containerControl != null)
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{
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return containerControl.ActivateControl(control);
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}
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return false;
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}
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/// <summary>
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/// Returns whether the supplied control is the currently
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/// active control.
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/// </summary>
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/// <param name="control">the control to check</param>
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/// <returns>true if the control is the currently active control</returns>
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public static bool IsActiveControl(this Control control)
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{
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Form form = control.FindForm();
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if (form == null)
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{
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return false;
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}
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Control activeControl = form.ActiveControl;
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while (activeControl != null
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&& (activeControl is ContainerControl)
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&& !Object.ReferenceEquals(control, activeControl))
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{
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var containerControl = activeControl as ContainerControl;
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activeControl = containerControl.ActiveControl;
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}
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return Object.ReferenceEquals(control, activeControl);
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}
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/// <summary>
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/// Selects the next control.
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/// </summary>
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/// <param name="control">The control.</param>
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/// <param name="next">if set to <c>true</c> [next].</param>
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public static void SelectNextControl(this Control control, bool next)
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{
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var containerControl = control.GetContainerControl();
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while (containerControl != null)
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{
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var containerControlAsControl = containerControl as Control;
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if (containerControlAsControl == null)
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{
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break;
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}
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var activeControl = containerControl.ActiveControl;
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if (containerControlAsControl.SelectNextControl(activeControl, next, true, true, false))
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{
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break;
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}
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if (containerControlAsControl.Parent == null)
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{
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break;
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}
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containerControl = containerControlAsControl.Parent.GetContainerControl();
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}
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}
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}
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}
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