I am building a WP7 application using Silverlight. This application includes a Page that makes use of the ListPicker. This ListPicker has data that is bound to it via my Page's view-model. The ListPicker displays the options correctly. However, the display looks odd.
When the options initially load, the first option appears selected. This selected item looks to be several pixels off from the top and the left. If I open-and-close the ListPicker, it looks as intended.
Has anyone else experienced this? Does any have any ideas how to overcome this? I attempted setting a binding on the SelectedIndex and SelectedValue properties, but this did not work.
Thank you!
I believe the SL ListPicker works under the assumption that there is always an active selection as long as it is bound to a non-empty dataset. Not sure if you can override this behavior; but seems like your problem is that the selected item looks awkward. Anyway you can adjust the template? Also, please see this post to make sure you are not caught off-guard with the SelectionChanged event.
Hope this helps!
Related
I'm facing a problem in implementing the following scenario:
When the user selects a record in a XamDataGrid, the control flows into another tab showing the details of the selected record.
The way I have done this is:
At the selection change of the XamDataGrid, I'm sending index of the tab to be activated using MVVM Light Messenger.
Setting the property bound to the Seledted Index of the Tab Control to that number.
Everything works smooth till here. Afetr that if I go back to the tab containing the grid, somehow the control comes back to tab which was activated.
As if, some intrinsic selection of cells in happening in the grid. Does Hover also affects the selection of the xamdatagrid?
I'm new to Infragistics and kind of confused. If some one can help.
All code are in View Model files and no code in the code behind of xaml file.
Cheers,
Anshuman
I played around a lot.
But the only way to get this wqorking was to disable all hover animations and effects.
Now it works as expected!
I'm having a problem with combobox popup (not sure if it's a problem of combobox). First when i click it, dropdown popup opens correct - upwards(there are about 50 items in it, and combobox is located in the bottom of the page, if it goes downwards, there would be only 5 items visible). But then if i select any item, and them open it again - it will open downwards and put items in a scroll. So how can I fix this and force popup open in the desired direction?
Are you setting the "MaxDropDownHeight" at some point? By default it is infinity but maybe setting to hard # greater than # in combo box might help.
Also I just tested this in SL4/Firefox and the combo box pops up each time (with or without a selected item). What version of SL are you using?
Well, what I've done - I subscribed to SizeChanged event of the Border element which is a child of Popup.Child canvas. In that method, I'm calculating space below and above the combo box and then setting Top offset using Canvas.SetTop method to that border and it's MaxHeight. Maybe I will post some code later.
I was having this exact same issue (actually with Silverlight 5, but the same behavior nonetheless). I tried various things with MaxDropDownHeight but that did not correct the problem.
#Walker the approach you mentioned in your answer sounded promising but I was not able to tell from your description how you actually implemented that.
In any case, I found a rather unlikely solution. I discovered that if I populated my ComboBox with ComboBoxItems instead of a collection of custom objects, then the dropdown/selection/direction issue does not occur. I've posted an answer here that goes into a little more detail.
I'm trying to achive displaying the RowDetailsTemplate of a Silverlight DataGrid depending on a bool Property, bound to a CheckBox Control's IsChecked Property. Insinde of my RowDetailsTemplate there is a single custom UserControl, containing further Controls.
Since the DataGrid only allows a global setting (RowDetailsVisibilityMode) Some code-behind is needed. I've implemented a solution based on Rorys Reply (and using a behaviour-technique) which actually works.
Unfortunately, The DataGrid doesn't remember the individually shown or hidden Rows on sorting. The checkbox remains selected, but the Row collapses. Further, no event like "OnAfterSort" or something similar seems to exist, where i could "Refresh" the visibility settings in a loop.
Another idea was to bind the Visibility of my custom Details-UserControl to the CheckBox bound value. This actually works (when settings RowDetailsVisibilityMode to "Visible"), but I'm not able to get rid of this weird behaviour: When the CheckBox is checked, the Detail Template expands and the detail UserControl appears. Nice. When the CheckBox is unchecked again, the UserControl disappears (Visibility is set to Collapsed) but the Row doesn't collapse and the blank space remains (as it would be set to Hidden not Collapsed).
Do you have any ideas?
I hope it's ok I didn't post any code samples, the implementation is pretty easy and I believe that the problem doesn't actually lie in a coding mistake i made. You can setup a simple DataGrid quickly like in this perfect MSDN Example. Starting from here, it's easy to test both described behaviours!
Really big thanks in advance,
- Thomas
I have a WPF app with a few Tabs. I'm now messing around with styling and have for example changed the ControlTemplate so I now have to define everything about the TabItem.
Now the TabItem that is selected seems detached from the document below because of some thin line around that content (there is no border). I'm not sure what technique to use to make it look attached again.
My guess would be that the Header-template is responsible for the problem. You can style that too tho - see this example for details: http://www.switchonthecode.com/tutorials/the-wpf-tab-control-inside-and-out
I've got a xaml TabControl and on one page, there are 3 RadioButtons each bound to a different property on the selected value of an adjacent ListView. After switching between selected items in the ListView, my radio buttons seem to forget they're bound and don't refresh.
So watching it in the debugger, when I switch to a new selected item, I see the non user code first checking the value on all 3 properties, then only the first two, and eventually only the first. However, if I change the tab and change back, it seems to give me another few uses.
The binding itself is fairly straightforward. a TwoWay binding of a bool property to IsChecked. It's 4 levels deep (Path=DataModel.Selected.A.B), but I have other things at the same depth that work fine.
Is this something people have heard about and know what might be going on? Or if the binding is somehow getting forgotten, is there a way to explicitly remind the xaml?
It is possible to manually update bindings like this:
TestCheckBox
.GetBindingExpression(CheckBox.IsCheckedProperty)
.UpdateTarget();
That being said, I don't have 100% confidence that this will correct your underlying issue. I haven't had this sort of issue before with WPF bindings, but I have had a couple weird issues with the tab control.
This is apparently somewhat of a known issue:
http://social.msdn.microsoft.com/forums/en-US/wpf/thread/8eb8280a-19c4-4502-8260-f74633a9e2f2/
In short, a RadioButton (through .Net 3.5sp1) somehow kills bindings of other RadioButtons when when it's checked while trying to uncheck any other buttons. The simple fix (read: hack) is to assign each radiobutton a different GroupName and then they don't try to mess with eachother
Another way to resolve this issue is to fake up a list of properties in a ListBox and have the ListBoxItem template be a radiobutton.