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using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using Pfz.WpfControls;
namespace Pfz.Extensions
{
/// <summary>
/// Adds methods to find enumerate all controls and sub-controls.
/// </summary>
public static class PfzElementExtensions
{
/// <summary>
/// Gets the actual element and all it's sub-elements recursivelly.
/// </summary>
public static IEnumerable<UIElement> EnumerateElementsRecursive(this UIElement element)
{
if (element == null)
yield break;
yield return element;
var contentCreatorControl = element as ContentCreatorControl;
if (contentCreatorControl != null)
contentCreatorControl.CreateContentNowIfNeeded();
var contentControl = element as ContentControl;
if (contentControl != null)
{
var content = contentControl.Content as UIElement;
foreach(var subControl in content.EnumerateElementsRecursive())
yield return subControl;
yield break;
}
Decorator decorator = element as Decorator;
if (decorator != null)
{
var content = decorator.Child;
foreach(var subControl in content.EnumerateElementsRecursive())
yield return subControl;
yield break;
}
Panel panel = element as Panel;
if (panel != null)
{
foreach(var child in panel.Children)
{
var content = child as UIElement;
foreach(var item in content.EnumerateElementsRecursive())
yield return item;
}
yield break;
}
ItemsControl itemsControl = element as ItemsControl;
if (itemsControl != null)
{
foreach(var child in itemsControl.Items)
{
var content = child as UIElement;
foreach(var item in content.EnumerateElementsRecursive())
yield return item;
}
yield break;
}
}
/// <summary>
/// Gets all elements of the given type, recursivelly, from the given base element.
/// </summary>
public static IEnumerable<T> EnumerateElementsRecursive<T>(this UIElement baseElement)
where
T: class
{
foreach(var element in baseElement.EnumerateElementsRecursive())
{
var typedElement = element as T;
if (typedElement != null)
yield return typedElement;
}
}
/// <summary>
/// Gets the first parent found of the given type.
/// </summary>
public static T GetParentOfType<T>(this FrameworkElement element)
where
T: class
{
while(element != null)
{
var parent = element.Parent;
if (parent == null)
return null;
T result = parent as T;
if (result != null)
return result;
element = parent as FrameworkElement;
}
return null;
}
/// <summary>
/// Gets the first element of the given type in the actual element.
/// </summary>
public static T FirstOrDefault<T>(this UIElement element)
where
T: class
{
foreach(var subElement in element.EnumerateElementsRecursive<T>())
return subElement;
return default(T);
}
/// <summary>
/// Finds the control that sets the given "cascading" property, considering the given element and its parent.
/// </summary>
public static DependencyObject FindPropertySetter(this FrameworkElement element, DependencyProperty property)
{
if (property == null)
throw new ArgumentNullException("property");
if (element == null)
return null;
if (element.ReadLocalValue(property) != DependencyProperty.UnsetValue)
return element;
while(true)
{
var result = element.Parent;
if (result == null)
return result;
if (result.ReadLocalValue(property) != DependencyProperty.UnsetValue)
return result;
element = result as FrameworkElement;
if (element == null)
return null;
}
}
/// <summary>
/// This method sets the value of a property, considering it is already set, be in this element or
/// in one of its parents.
/// Throws an exception if the property is not set until the last parent.
/// </summary>
public static void ChangeValueWhereSet(this FrameworkElement element, DependencyProperty property, object value)
{
if (element == null)
throw new ArgumentNullException("element");
if (property == null)
throw new ArgumentNullException("property");
DependencyObject origin = FindPropertySetter(element, property);
if (origin == null)
throw new ArgumentException("property is not set.");
origin.SetValue(property, value);
}
/// <summary>
/// Tries to focus all elements and sub-elements of this control.
/// Returns when the first one is focused.
/// </summary>
public static bool FocusFirstFocusable(this FrameworkElement element)
{
foreach(var control in element.EnumerateElementsRecursive<UIElement>())
if (control.Focus())
return true;
return false;
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).