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using System;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
namespace MaterialDesignThemes.Wpf
{
/// <summary>
/// Helper extensions for showing dialogs.
/// </summary>
public static class DialogHostEx
{
/// <summary>
/// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
/// </summary>
/// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
/// <param name="content"></param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <remarks>
/// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
/// </remarks>
/// <returns></returns>
public static async Task<object> ShowDialog(this Window window, object content)
{
return await GetFirstDialogHost(window).ShowInternal(content, null, null);
}
/// <summary>
/// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
/// </summary>
/// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="openedEventHandler">Allows access to opened event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <remarks>
/// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
/// </remarks>
/// <returns></returns>
public static async Task<object> ShowDialog(this Window window, object content, DialogOpenedEventHandler openedEventHandler)
{
return await GetFirstDialogHost(window).ShowInternal(content, openedEventHandler, null);
}
/// <summary>
/// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
/// </summary>
/// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="closingEventHandler">Allows access to closing event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <remarks>
/// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
/// </remarks>
/// <returns></returns>
public static async Task<object> ShowDialog(this Window window, object content, DialogClosingEventHandler closingEventHandler)
{
return await GetFirstDialogHost(window).ShowInternal(content, null, closingEventHandler);
}
/// <summary>
/// Shows a dialog using the first found <see cref="DialogHost"/> in a given <see cref="Window"/>.
/// </summary>
/// <param name="window">Window on which the modal dialog should be displayed. Must contain a <see cref="DialogHost"/>.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="openedEventHandler">Allows access to opened event which would otherwise have been subscribed to on a instance.</param>
/// <param name="closingEventHandler">Allows access to closing event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <remarks>
/// As a depth first traversal of the window's visual tree is performed, it is not safe to use this method in a situtation where a screen has multiple <see cref="DialogHost"/>s.
/// </remarks>
/// <returns></returns>
public static async Task<object> ShowDialog(this Window window, object content, DialogOpenedEventHandler openedEventHandler, DialogClosingEventHandler closingEventHandler)
{
return await GetFirstDialogHost(window).ShowInternal(content, openedEventHandler, closingEventHandler);
}
/// <summary>
/// Shows a dialog using the parent/ancestor <see cref="DialogHost"/> of the a given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="childDependencyObject">Dependency object which should be a visual child of a <see cref="DialogHost"/>, where the dialog will be shown.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <returns></returns>
public static async Task<object> ShowDialog(this DependencyObject childDependencyObject, object content)
{
return await GetOwningDialogHost(childDependencyObject).ShowInternal(content, null, null);
}
/// <summary>
/// Shows a dialog using the parent/ancestor <see cref="DialogHost"/> of the a given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="childDependencyObject">Dependency object which should be a visual child of a <see cref="DialogHost"/>, where the dialog will be shown.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="openedEventHandler">Allows access to opened event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <returns></returns>
public static async Task<object> ShowDialog(this DependencyObject childDependencyObject, object content, DialogOpenedEventHandler openedEventHandler)
{
return await GetOwningDialogHost(childDependencyObject).ShowInternal(content, openedEventHandler, null);
}
/// <summary>
/// Shows a dialog using the parent/ancestor <see cref="DialogHost"/> of the a given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="childDependencyObject">Dependency object which should be a visual child of a <see cref="DialogHost"/>, where the dialog will be shown.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="closingEventHandler">Allows access to closing event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <returns></returns>
public static async Task<object> ShowDialog(this DependencyObject childDependencyObject, object content, DialogClosingEventHandler closingEventHandler)
{
return await GetOwningDialogHost(childDependencyObject).ShowInternal(content, null, closingEventHandler);
}
/// <summary>
/// Shows a dialog using the parent/ancestor <see cref="DialogHost"/> of the a given <see cref="DependencyObject"/>.
/// </summary>
/// <param name="childDependencyObject">Dependency object which should be a visual child of a <see cref="DialogHost"/>, where the dialog will be shown.</param>
/// <param name="content">Content to show (can be a control or view model).</param>
/// <param name="openedEventHandler">Allows access to opened event which would otherwise have been subscribed to on a instance.</param>
/// <param name="closingEventHandler">Allows access to closing event which would otherwise have been subscribed to on a instance.</param>
/// <exception cref="InvalidOperationException">
/// Thrown is a <see cref="DialogHost"/> is not found when conducting a depth first traversal of visual tree.
/// </exception>
/// <returns></returns>
public static async Task<object> ShowDialog(this DependencyObject childDependencyObject, object content, DialogOpenedEventHandler openedEventHandler, DialogClosingEventHandler closingEventHandler)
{
return await GetOwningDialogHost(childDependencyObject).ShowInternal(content, openedEventHandler, closingEventHandler);
}
private static DialogHost GetFirstDialogHost(Window window)
{
if (window == null) throw new ArgumentNullException(nameof(window));
var dialogHost = window.VisualDepthFirstTraversal().OfType<DialogHost>().FirstOrDefault();
if (dialogHost == null)
throw new InvalidOperationException("Unable to find a DialogHost in visual tree");
return dialogHost;
}
private static DialogHost GetOwningDialogHost(DependencyObject childDependencyObject)
{
if (childDependencyObject == null) throw new ArgumentNullException(nameof(childDependencyObject));
var dialogHost = childDependencyObject.GetVisualAncestry().OfType<DialogHost>().FirstOrDefault();
if (dialogHost == null)
throw new InvalidOperationException("Unable to find a DialogHost in visual tree ancestory");
return dialogHost;
}
}
}
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