When I drag and drop a TextBox from the toolbox onto a WinForm, I can drag it around on the form as I like.
Now I create a new class and inherit it from TextBox. I add a new property called CaptionLabel. When set to a value, I dynamically create a Label control, set its value and finally add the label to the TextBox' parent controlcollection.
The result is a "LabeledTextBox".
However, when selecting the TextBox, I still only get the TextBox selected... the selection rectangle does not include the Label, created dynamically.
How do I extend the rectangle so that it also contains the Label and make the label "know" that it belongs to the TextBox?
Or is there a better way to create labeled controls?
if I understand correctly, you need to have one label and one TextBox were one element?
if i right you need create new control, for that create new project type WindowsFormsControlLibrary?
Related
I have a pretty simple use case but I cannot make it work right. I've got a ListView whose item template is a Note custom UserControl:
Each Note has a few simple controls as shown.
I want this to work so that if a row is selected programmatically or by clicking somewhere in it, it sets focus to the first textbox in that row. But if you click on a control in the row, it activates that control (i.e. lets you edit the Exhibit contents or click the Delete button).
If I don't do anything to set focus, clicking on the row highlights the row but doesn't set focus to any child control.
Within the Note control I have tried this:
protected override void OnGotKeyboardFocus(KeyboardFocusChangedEventArgs e)
{
base.OnGotKeyboardFocus(e);
text.Focus();
}
text is the name of that first TextBox, and it does set focus, but it also does this if I click directly on the Exhibit textbox or Delete button, making them unusable.
So, how can I enable the focusing that I want when the container control gets focus, UNLESS it got that focus via a click on a specific child control (which should then keep the focus)?
After a bit more searching, I found the correct way to implement this: at the root of the container control (the Note UserControl in my case), you can specify the name of the control to be the default focus control:
FocusManager.FocusedElement="{Binding ElementName=text}
Not sure how I missed that one.
I am asking for a programming approach.
This is my problem:
I have a WPF window, with a ComboBox at the top.
When user select the item in combobox, depends on the selection, the Grid below it will show a corresponding element, for example: if use choose Display from combobox, then the element in Grid will change to a ListView; and when user choose Add from combobox, the element in Grid will change to a form(textboxes).
Should I create several Grid, collapse them, and show them only when user make selection? Or any other more brilliant ideas?
Thanks.
Put a UserControl in the cell, and set its Content according to the control selected in the ComboBox.
There can be two ways:
You add one panel containing the controls required for each of the items in the combobox. You can hide all of them and on SelectedIndexChanged, you can show the appropriate panel. This will need more memory, but the implementation is simpler.
The other way will be to have a single panel and render the controls in run time on SelectedIndexChanged. This will need less memory, but will be complex to implement. Also rendering on run time might need some additional time (so the throughput).
What you can do is place a Panel(Like Grid, DockPanel) below the combobox and based on it's selection, dynamically add/remove controls in the panel.
For ex: If the user selects Display, then, remove all the child elements of the Panel and add a GridView.If Add is selected, remove all child elements and add a TextBox.
After adding, attach an event handler in code behind to perform the action you would want to perform.
I have to develop a control having one datagrid. now datagridtextcolumn have to be binded with one property of collection created in viewmodel.
based on data i have do one thing...
if for a row no of lines is more than 3 in last column's cell then show a button having text "More" with last cell else with text "Less" and on click of "More" button it should display full text data...
now this layout can be shrined as well as stretched at runtime according to window's height and width using viewbox control or any other way...
so how to achieve this thing any idea???
Basically you want a custom textblock control that displays a max of 3 lines and shows a more button (if there are more than 3 lines of text)*.
The more button expands the textblock and I imagine stays around to collapse it again?
As it sounds like you only have one column (more like a list), rather than customise the datagrid create a usercontrol (with a grid, textblock and button) that does what you want and bind that inside a templated column instead.
You will need to expose the Text property as a dependency property for it to bind to. Most of the details of creating this type of usercontrol are on my answer to this: putting Button inside a TextBlock(or maybe something else) to make it work like the one on video?
Just add your size logic and change the layout to suit your needs.
*Note: Personally I would use the MinHeight property of the usercontrol to set when the "More" button is needed, then it will be more flexible, but that is just a suggestion.
My WPF combobox is populated with a different set of strings each click of a button. There are other controls on the window as well. The combobox is the 'first' (top) in the window, but the text doesn't get highlighted. When the user tabs through the controls, the text DOES get highlighted, but when it's the first on the window, it doesn't.
Maybe i need to force a highlight on the individual textbox control 'within' the combobox itself, but how would i do this? I couldnt seem to find the internal 'structure' of this control anywhere. Could anyone help here?
Jack
to get the TextBox of Combobox you can use
TextBox TxtBox = (TextBox)myCombo.Template.FindName("PART_EditableTextBox", myCombo);
I'm not sure it's the best solution, but you can use FrameworkElement.FindName to access the child control -- it's guaranteed to be present in a combobox, because it's a key constituent part of the control.
That stated, is it not better to try and call .Focus() on the control? That is likely why when you tab, the highlight is provided.
Another option is to derive from ComboBox, and expose the child text box as a property allowing you to set it's selection, or add a method directly to the combobox to set it for you.
is it possible to create a combobox in wpf from code, which I could position wherever I want on the window?
In my case, I basically want to create something like a Autocomplete for DataGrid rows,...
Thanks!
TextBox supports auto complete, and you can create your datagrid's template column and you can specify the template with textbox which can interact and give you autocompletion.
if you put it in a <Popup> you can then position the popup wherever you want--it is not "bound" by a parent container.