Tuning Up The TreeView - Part 1. Download the source code (requires Visual Studio 2008) - 22.43 KB Introduction Recently, as part of a larger project, I had occasion to dig into the WPF TreeView control. I followed what I think is the standard development process: read over some sections in my WPF books, and then went online hunting for code. As I got farther into my particular requirements and implementation, I bumped into some gnarly issues that other people were also struggling with. Some of these problems required just an "aha" moment or online tip to solve, while others sent me off into the wilderness for days. Eventually, the code got smaller and simpler, and I decided that it would be useful to give what I learned back to the community.
The Problem My application is a tool to profile space utilization on a disk drive. Color code the folders so that "hot-spots" jump out: red for the larger "hot" areas of usage; blue to represent "cold" or relatively small areas, etc. WPF TreeView Control TreeNode Class A Blind Alley. Vue d'ensemble de ScrollViewer. Advanced Custom TreeView Layout in WPF. Download source files - 417 Kb Introduction In a previous article here on the CodeProject I demonstrated one way of redefining how a WPF TreeView can be displayed.
In that article we examined how to make a TreeView look like an Org Chart by using some XAML magic. In this article we will explore a more complex and interactive customization, which makes the TreeView present its items as a set of "nested buckets. " Show me the money Let's take look at what the customized TreeView looks like. The top portion of the user interface is the customized TreeView. If we did not apply a layout customization to the TreeView seen above, it would look like this: What is a layout customization? Take another quick glance again at the non-customized TreeView screenshot above. TreeView and TreeViewItem both derive from ItemsControl. How it works Data Format Before delving into the code which implements our custom layout, let's take a moment to review the data being displayed. TreeViewItem Style. Introduction to Attached Behaviors in WPF. Download demo project (requires Visual Studio 2008) - 21.3 KB Introduction This article explains what an attached behavior is, and how you can implement them in a WPF application.
Readers of this article should be somewhat familiar with WPF, XAML, attached properties, and the Model-View-ViewModel (MVVM) pattern. I highly recommend that you also read my ‘Simplifying the WPF TreeView by Using the ViewModel Pattern’ article, because the material here is an extension of the material presented in it. Background Back in May of 2008, I published an article called ‘Simplifying the WPF TreeView by Using the ViewModel Pattern’. That article focused on the MVVM pattern. Pascal wanted to know how to scroll a TreeViewItem into the viewable area of the TreeView control when its associated ViewModel object selects it. For example, suppose that the user searches through a TreeView for an item whose display text matches a user-defined search string. Attached Behaviors Demonstration Conclusion References. Drag and Drop Feature in WPF TreeView Control.
Introduction Windows Presentation Foundation (WPF) is a new technology introduced in .NET 3.0 with the name of Avalon that enables rich control, design, and development of the visual aspects of Windows programs. A WPF application can run on desktop and on web browser as well. WPF provides much ease in drag and drop operations among controls. Much of the work related to Drag and Drop has already been done and you just need to use them. Using the Code To enable Drag and Drop feature in WPF TreeView control, follow the steps given below: Set TreeView control’s property AllowDrop="True". Points of Interest I read many articles and blogs on enabling drag and drop operation in WPF controls, and finally I am able to write this code.
History 29th January, 2010: Initial post Irfan alam Software DeveloperTechnology Promotion InternationalSingapore. Simplifying the WPF TreeView by Using the ViewModel Pattern. Download the source code (requires Visual Studio 2008) - 28.6 KB Introduction This article explores how to use the ViewModel pattern to make it easier to work with the TreeView control in WPF. Along the way, we examine why people often have difficulty with the WPF TreeView, what a ViewModel is, and two demo applications that show how to combine a TreeView with a ViewModel.
One of the demos shows how to create a searchable TreeView, the other demonstrates how to implement lazy-loading (a.k.a. load-on-demand). Background of TreeView The TreeView control in WPF has gained an undeserved bad reputation. In Window Forms, it is very easy to use the TreeView control because it is dead simple. In contrast, the WPF TreeView is extremely flexible, inherently supports UI virtualization (i.e., TreeViewItems are created on-demand), allows for full visual customization, and has full support for data binding. Background of ViewModel This makes it easier to create a user interface (UI) for the application. WPF Treeview Databinding Hierarchal Data with mixed types. Données et WPF : Personnalisez l'affichage des données avec la liaison de données et WPF. Données et WPF Personnalisez l'affichage des données avec la liaison de données et WPF Josh Smith Lorsque Windows® Presentation Foundation (WPF) est apparu pour la première fois sur le radar .NET, la plupart des articles et des applications de démonstration faisaient l'éloge de son moteur de rendu et de ses superbes capacités 3D.
Bien que ces exemples soient amusants à lire et à essayer, ils ne démontrent pas la puissance pratique des fonctionnalités de WPF. La bonne nouvelle est que WPF offre un excellent support de gestion de l'affichage et d'édition de données complexes. Lier dans du code L'un des changements les plus importants introduits par WPF pour les développeurs d'applications de bureau sont l'emploi intensif et la prise en charge de la programmation déclarative.
Dans de nombreuses situations, il est plus facile et rapide de déclarer des liaisons dans XAML. Static void BindText(TextBox textBox, string property) { DependencyProperty textProp = TextBox.TextProperty; if (! WPF Tutorial - Using The ListView, Part 1. Many of the controls in WPF have a downright dizzying array of capabilities and features, due in large part to the composibility of all the components. The ListView control is a great example of this - the possibilities are almost endless. This series of tutorials on the ListView will hopefully make the space of possible options seem not quite as daunting. We will be starting today with a simple grid based list view, showing how to create columns and some different ways of getting data into those columns. This tutorial won't be very exciting - we will mostly just be setting up the basics for use in some of the later parts. Hopefully, the series will culminate in a sort of "DataGridView" for WPF (a control that, sadly, does not yet exist in WPF).
Ok, so here's a screenshot of a ListView with a few columns and no data. The code to create this is just as boring: The special code here is in the ListView.View section. So we make a GridView and then we make a couple GridViewColumns. WPF DataGrid Practical Examples. Download source code - 65.44 KB Contents Introduction A DataGrid is a user interface component for displaying tabular data to the user, typically providing sorting and editing functionality, among others.
DataGrids have been the work-horse of various frameworks such as ASP.NET (GridView) and Windows Forms (DataGridView). However, DataGrids in WPF are rather conspicuous in their absence! Fortunately, the absence of this control has not hampered the popularity of WPF. The versatility of the ListView control allows very flexible read-only DataGrid functionality. Eventually, in August 2008, Microsoft released its DataGrid CTP (Community Technology Preview - a public beta) to CodePlex to coincide with the release of the .NET Framework 3.5 SP1 and Visual Studio 2008 SP1.
More recently, on October 22 2008, DataGrid v1 was released. Article Overview I cannot, of course, cover everything. Installing the WPF Toolkit The WPF DataGrid is part of the WPF Toolkit. Install the .NET Framework 3.5 SP1. Drag and Drop Items in a WPF ListView. Download source files - 20 Kb Introduction This article presents a class called ListViewDragDropManager, which automates drag-and-drop operations in the WPF ListView. It allows the user to drag and drop items within a ListView, or drag items from one ListView to another. The class is smart enough to figure out where in the ListView the user wants to drop an item, and will insert the item at that location automatically. The class also exposes several properties and one event that enables a developer to customize the way that the drag-and-drop operations behave. Background Drag-and-drop is ubiquitous in modern user interfaces. WPF has support for drag-and-drop built into its framework, but there is still a lot of legwork you must take care of to make the out-of-the-box functionality work smoothly.
I thought that implementing such a class would be a trivial effort. What it is WPF is very flexible, and that can make it difficult to create a generic helper class which provides a simple service. A Guided Tour of WPF – Part 3 (Data binding) Table of contents Part 1 (XAML): Learn about XAML and how it is used in WPF applications. Part 2 (Layout): Learn about layout panels and how they are used to construct user interfaces. Part 3 (Data binding): Learn how WPF data binding works and how it can be used. Part 4 (Data templates and triggers): Learn how data templates and triggers work and how they can be used. Part 5 (Styles): Learn about how UIs can be styled in WPF. Introduction This is the third article in an introductory series about the Windows Presentation Foundation. For a comprehensive review of WPF data binding be sure to refer to the links listed in the External links section at the bottom of the page.
Background Data binding in the user interface layer is nothing new. The architects of some earlier UI platforms have done a good job integrating data binding with the rest of their framework. Dependency properties Dependency properties are like normal .NET properties on steroids. DataContext The Binding class Data binding. WPF Toolkit DataGrid, Part I – Introduction | Samuel Moura's DevUX.
Recently I had to recreate in WPF a Windows Forms panel that used DevExpress XtraGrid to present data in tabular form, keeping the same look and feel as it was part of an existing application. I Googled around to find out what different solutions exist out there for presenting data this way in WPF. After searching for a while and looking at solutions I found a few interesting ones: I ended up using WPF Toolkit. The main reasons were: WPF Toolkit is free, open source and it was the one that allowed me greater flexibility.
In this series of articles I intend to present you with all the functionality I managed to implement on my UserControl. For obvious reasons I will not disclose the code developed within our project but will provide working samples of the most relevant achievements in detail using a sample application. To access WPF Toolkit’s DataGrid start by downloading and installing the latest release on your PC. Roadmap In this article we will go through the following topics: