2019-12-02 20:37:41 +10:00
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// Copyright © 2019 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.Example
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{
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public static class ControlExtensions
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{
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2021-11-26 10:09:59 +10:00
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/// <summary>
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/// Finds the parent for the given control of <typeparamref name="T"/>
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/// </summary>
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/// <typeparam name="T">Type</typeparam>
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/// <param name="control">control</param>
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/// <returns>Parent or null</returns>
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public static T GetParentOfType<T>(this Control control) where T : Control
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{
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if(control.IsDisposed || !control.IsHandleCreated)
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{
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return default;
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}
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var current = control;
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do
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{
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current = current.Parent;
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if (current == null)
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{
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return default;
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}
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}
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while (current.GetType() != typeof(T));
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return (T)current;
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}
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2019-12-02 20:37:41 +10:00
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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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public static void InvokeOnUiThreadIfRequired(this Control control, Action action)
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{
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//See https://stackoverflow.com/questions/1874728/avoid-calling-invoke-when-the-control-is-disposed
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//for background and some guidance when implementing your own version.
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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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}
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}
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