I have a tree view control which has some nodes. I want Auto Ellipsis property to tree view node as like label control have. I did Google but not get relevant information or method to achieve this task.
I am using c# as a programing language and .net framework 3.5 as a platform. I am making program in windows form not in WPF.
Thanks.
You're right, that property doesn't exist. The TreeView control will display a horizontal scrollbar if the labels for any of the nodes are longer than the viewable area for the control.
The only option you have to replace this with an ellipsis is to owner-draw the control. But since you only want to change the text of the nodes, you can set the DrawMode property to OwnerDrawText (rather than OwnerDrawAll), which significantly reduces the burden of owner drawing.
You can find sample code for owner drawing a TreeView control here on MSDN.
Remember that the ClientRectangle property of a control, including the TreeView control, will tell you the actual width of the control's client area. Use this to determine if the node label is too long, and whether or not it needs to be drawn with ellipses.
The various overloads of the TextRenderer.DrawText method will allow you to draw the node labels in a way that resembles the way the native control draws itself (i.e., using GDI rather than GDI+). Passing an appropriate combination of TextFormatFlags will instruct the method to automatically trim text and replace it with an ellipsis.
Related
I'm building a drag/drop application in winforms c#, i need to drag a usercontrol and drop it to a flowlayoutpanle.
everything works fine, except the drop location, the flowpanel sets the droped items side by side.
how can I set the droped item to the the exact cursor position?
I'll extend my comment to an answer.
The problem is not based on drag'n'drop. The problem is based on a semantic level. A flowlayoutpanel is used, to automatically arrange it's contents.
See MSDN FlowLayoutPanel Control Overview
The FlowLayoutPanel control arranges its contents in a horizontal or
vertical flow direction. You can wrap the control's contents from one
row to the next, or from one column to the next. Alternately, you can
clip instead of wrap its contents.
So the flowlayoutpanel-control does exactly what it's supposed to do. If you want to give the dropped control a specific location based on coordinates you want to use a normal panel. A normal panel will not arrange its contents automatically.
I have Image control in my Window. The size of this Image control is set to "Auto".
<Image x:Name="videoImg" Stretch="Fill" Height="Auto" Width="Auto" />
When i try to get access, it returns 0. How to see real size of this control? It resizes with window.
You can use .ActualHeight and .ActualWidth to get the rendered Height/Width of a control
The thing is, the Width and Height properties let you express the desired size, whereas what you want is the rendered size - which can be accessed (but not set) using the ActualWidth and ActualHeight properties.
It should be noted that these aren't static values either, that is, once set they are not necessarily going to be the same forever after, as it will be re-evaluated upon each rendering sequence...
Because [ActualHeight / ActualWidth] is a calculated value, you should be aware that
there could be multiple or incremental reported changes to it as a
result of various operations by the layout system. The layout system
may be calculating required measure space for child elements,
constraints by the parent element, and so on.
So, depending on your requirements, you might want to consider re-evaluating your data at appropriate points, perhaps when the containing control resizes, for instance.
While some of WPF controls fill up all available space when laid out and rendered, the others don't.
Specifically, the Image control is not of a kind that establishes its size on its own, i.e., in cases when you do not specify control's size explicitly with width/height attributes or the like.
But the Grid control fills up all available space when lacking size-defining attributes. The Page/Window template in Visual Studio has a Grid control as a child of a Page/Window root control, and when the user starts to put controls on a page in a graphical editor, the user-added controls first become children of this Grid control.
If you have used the VS template, and your Image control is a child of the said Grid control, name your Grid with an x:Name attribute, and you can use the Grid's ActualWidth/Height properties for your needs in a code-behind, because the image control grows up to its parent Grid size -- provided you do not specify its size explicitly or otherwise, i.e., setting the Image content.
By the way, the sizing behavior of built-in controls can be changed. You can modify a control and override corresponding dependency properties. See, for example, https://stackoverflow.com/a/6094993 .
I was wondering what is the best way to print entire content of scrollable control. I was trying to print a control in several ways, however all the time I was only able to draw visible content of control. So far I tried to use
PrintForm // there is nothing I can do with this because it requires a form not a control
I was also trying to use controlName.DrawToBitmap() method however this function captures only the visible area of control.
What is the best way to draw this kind of controls ?? I would like to avoid scrolling control's content in order to capture all control's element.
I would suggest that you create an invisible to the end-user form (for examlpe, position it at (-10000, -10000) and this form should have the size enough to display the ScrollableControl without scrollbars. This way you will be able to workaround this problem.
I need to create a custom control that has an expandable part as a panel and a textbox part. The expandable part is a panel, that will either be visible or invisible. But when the panel is visible/expanded directly under the textbox, I do not want the adjacent controls to shift down below the panel, but the panel should just overlay the controls that are there just under the custom control. How would I implement this in Winforms C# project?
I am open to using user control for this scenario.
Thanks
Sunil
I think your implementation of expanding and collapsing is not the best, because you are just overlaying the controls instead of hiding them.
One of the disadvantages is that the overlaid controls might by focussed by pressing tab and they might have a value which I think it is out of target.
I would suggest another implementation by creating two panels (one for the header and another one for the content) and when the collapse button is pressed then the content's panel will be hidden by sitting its Visible property to false and its Hight to 0.
I can draw a 3D border using ControlPaint.DrawBorder3D, but I get the 'Windows Classic' 3D border. I want to draw the current theme's 3D border - in the default XP theme, this is a 1px blue or gray border. How do I draw that, and how do I get its widths?
Sounds like you might need to look at System.Windows.Forms.VisualStyles.VisualStyleRenderer:
The System.Windows.Forms.VisualStyles
namespace exposes VisualStyleElement
objects that represent all of the
controls and user interface (UI)
elements that are supported by visual
styles. To draw or get information
about a particular element, you must
set a VisualStyleRenderer to the
element you are interested in.
To draw an element, use the
DrawBackground method. The
VisualStyleRenderer class also
includes methods, such as GetColor and
GetEnumValue, that provide information
about how an element is defined by the
current visual style.
There's a code sample on that page as well.
You will have to draw the border yourself, but you can get the color from VisualStyleElement.Window.Caption.Active and the size should be the size of the window frame (I believe), which is VisualStyleElement.Window.FrameBottom.Active. If you explore the VisualStyleElement.Window, you should be able to determine which window element has the information you need to draw your border.
Pre .NET Framework 2.0 Answer
I'm assuming that you are drawing your own, special control and you want to use elements of the currently active theme to draw it so it better fits with standard XP controls. You're NOT trying to, for example, enable theming on a standard Button control. Correct?
It's actually somewhat complicated. Your main focus should be UxTheme.dll. This houses everything you need for drawing themed controls. Here is a nice C# wrapper around this dll to make your life easier. There are others so if this isn't exactly what you wanted, I hope I've pointed you in the right direction.