Posts tagged with 'winforms'

csharp winforms syntax digitalrune sharpdevelop batch

Batch Syntax Highlighting in the DigitalRune Text Editor Control

A brief article which describes how to create a definition ruleset to allow better Batch/Command style formatting in the DigitalRune/SharpDevelop Text Editor control.

Richard Moss

Jun 23, 2014

csharp winforms graphics opensource color rgb hsl colorpicker

ColorPicker Controls 1.0.4.0 Update

The [ColorPicker Controls](https://github.com/cyotek/Cyotek.Windows.Forms.ColorPicker) have been updated to version 1.0.4.0. This is a fairly substantial update, with quite a few bug fixes and enhancements to the code. I'll also briefly discuss plans for future updates to the library.

Richard Moss

Apr 13, 2014

csharp winforms imagebox drag resize

Adding drag handles to an ImageBox to allow resizing of selection regions

The `ImageBox` control is already a versatile little control and I use it for all sorts of tasks. One of the features I recently wanted was to allow users to be able to select a source region, then adjust this as needed. The control already allows you to draw a selection region, but if you need to adjust that ... well, you can't. You can only draw a new region. This article describes how to extend the `ImageBox` to include the ability to resize the selection region. A older demonstration which shows how to drag the selection around has also been incorporated, in a more tidy fashion than the demo.

Richard Moss

Feb 13, 2014

csharp winforms interop pinvoke wm-activateapp

How to be notified when your application is activated and deactivated

I recently had a requirement where a user was able to perform an action externally to my application, and my application then had to detect this for processing. I could of course just had a poller running away in the background to check, but as the requirement also needed user input, why not just wait until the user switched back to my application, then check and deal with accordingly? This article describes how to intercept the `WM_ACTIVATEAPP` message from your C# application and put it to good use.

Richard Moss

Dec 29, 2013

csharp winforms treeview

Extending the LabelEdit functionality of a TreeView to include validation

An article which describes how to add validation support to a `TreeView` control that is using custom label edit functionality.

Richard Moss

Oct 28, 2013

csharp winforms api treeview sendmessage tvm-geteditcontrol wm-settext pinvoke

Specifying custom text when using the LabelEdit functionality of a TreeView

An article which describes a robust yet simple way to have custom text when using the `LabelEdit` functionality of a `TreeView` and working around the limitations of Windows Forms using C# along with the `TVM_GETEDITCONTROL` and `WM_SETTEXT` messages.

Richard Moss

Oct 28, 2013

csharp winforms getcomboboxinfo comboboxinfo

Getting the hWnd of the edit component within a ComboBox control

A short tip which describes how to access the hWnd of the edit component contained within a `ComboBox` control via the Win32 API using `GetComboBoxInfo` and `COMBOBOXINFO`.

Richard Moss

Sep 29, 2013

csharp winforms applicationcontext

Creating long running Windows Forms applications without a start-up form

Sometimes you may wish to create an application that sits running in the background but doesn't actually display an initial user interface. However, the user can interact with the application and so therefore its not appropriate to be a service. Often such applications are accessible from a system tray icon. Another viable requirement might be for multiple top level windows, for example recent versions of Microsoft Word, where each document has its own application window. By default however, a normal Windows Form application displays the start-up form which definitely isn't desirable, especially as hiding this form isn't as straightforward as you might expect. Fortunately however, the framework provides us with the `ApplicationContext` class that can be used by `Application.Run`. This article describes how to use application contexts to create an application that initially has only a system tray icon to which further functionality can be accessed.