That might be a silly question, but I just can figure how to resolve it for now.
I'm building a wpf application with drag and drop between a ListView and a Grid.
My items being consituted by an Image and a TextBlock. I have defined a DataTemplate with a StackPanel containing these controls and applied it to ListView items and ContentControls inside of the Grid cells.
Basic idea is to chose items from the ListView and drag them to a cell. So my grid is empty at the beginning.
My problem, besides of sucking at making my controls filling correctly my grid (bonus ninja question !), is that when no item is chosen in a cell the image is not drawn and will not act as drop target. Only the TextBlock will.
Is there a way to counter that ? Thank you :)
You can set a datatemplate trigger so that you display an empty image that will accept the drop, if the contents are null.
And if that idea doesn't work, you can create a datatemplateselector that returns a template with a blank dropping target if the content is null. This shows how to make a selector that can let you set all possible templates using only xaml.
Related
I am trying to achieve functionality similar to that of a Popup, without using a Popup, but instead adorning my ContentControl with a basic adorner. Basically, I want the ContentControl to have an "overlay" effect, whereby it is the topmost object, above all other elements - similiar to that of the Popup control.
Here is the problem that I am running into, and I am hoping that someone can point out where I am going wrong:
I have a stand grid with two row definitions. The first row contains a UI element - for example, a rectangle. The second row contains a custom control that I have developed to emulate the functionality of a "drawer" sliding out. Basically, when I click on button, I am going to animate a TranslateTransform to "slide" my ContentControl "up". This works fine - except that it gets cropped underneath the rectange in the first row of the grid. If I remove the row definitions in the grid, then when the desired behavior is achieved - the ContentControl is moved "up" and partially "on top" of the rectangle. The rectangle is merely a place holder for what I am trying to achieve. I basically want to have a drawer type control that can slide out and be on top of all other controls.
I am somewhat new to using the Adorner class, so, I am hoping that someone can please point out where I am going wrong.
Thanks.
Chris
Change the parent of the adorner to the full grid, and not just your control. If you put a control in a grid row, and set the adorner to adorn the control, it will usually be clipped to that row because the control is.
How to implement textbox similar to facebook textbox in privacy settings where you can add to textbox custom controls:
One of the way that i came to is to create wrappanel where last item will be textbox.
Are there any other ways?
Thanks.
that's the only thing that comes to my mind... just have a stackpanel (wrappanel) and add items from left to right where the last one is the actual textbox...place everything in a nice canvas add some border and set the margins of the textbox to 0 so that it will fill up all the space if there is no other control in it...
it looks like it's not that big of a problem:)
I implemented a drag and drop of an image from a Grid to another Grid using built-in MouseDragElementBehavior class. Then I needed to use a bit more complex layout for the source items so used ListBox and ItemTemplate instead.
The problem is now when dragging an item from the ListBox it is only visible when above the ListBox. How do I make it always visible and following mouse cursor anywhere while being dragged?
I suggest that instead of writing your own implementation using the Blend SDK, that you use the Silverlight Toolkit ListBoxDragDropTarget control.
The reason the item disappears in your element is that the MouseDragElementBehaviour is simplistically applying a render transform to affect the movement. However the ListView places its item panel inside a ScrollViewer which clips its content to its viewport.
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.
I have to change Listbox's control templated in a way that it can look like below image
alt text http://www.freeimagehosting.net/uploads/05598e4d35.png
i have added togglebutton in listboxdatatemplate...
have one stackpanel in listbox style template...
so structure is like
border - stackpanel - grid - itemcontainer[boder-togglerbutton]
now to make first and last item curved... what are the ways...
if i make stackpanel border curved... when firstitem is selected and its background is changed... it shows a square inside outer border... so i am not able to get look showed below...
any idea?? how to get design done in the way with listbox tht can be showed like image above...
in image 1,3 and 4 items are selected and others are in normal mode...
-thanks in advance
I did it with a listbox in Blend inside of the ItemTemplate by creating a leftBorder and a right Border that are in the same space. The leftBorder is defined with cornerRadius 10,0,0,10 and the right with cornerRadius 0,10,10,0. I then set them both to opacity 0 (you can use visibility if you prefer) and set a ChangePropertyAction on both of thier loaded events conditional on the first and last item in your list.
That is the bad part, I did need to do it conditional on the items in your list but you could define another property and set that to first and last or create multiple templates that you set if there are no more items in the list from the control (not in the template).
If you think this may be interesting to you, let me know and I will post on my blog as well as try to make a couple of adjustments for your situation. I am not sure how to upload a project to here.