I have customized a field which contains an ObjectChoiceField. After clicking a choice，the screen just scrolls to the top and the choice field drops down from the visibile screen。Pls tell me how to prevent this。Thank you。
You can find out custom drop down list implementation in this thread: Issue in PopUpScreen
This custom drop down does what you want.
Related
When you highlight text in iOS, a menu is shown giving options such as cut and copy, it floats above the text and is black. What is this called and how can i implement it in a tableview (to give options when a row is selected)
You mean this, this is a UIMenuController
https://developer.apple.com/library/ios/documentation/iPhone/Reference/UIMenuController_Class/
another bit of info:
http://nshipster.com/uimenucontroller/
How to use it:
https://www.captechconsulting.com/blogs/getting-started-with-uimenucontroller-in-ios-5
An actual example already coded up for you:
https://github.com/jszumski/uimenucontroller-example
It is called UIMenuController.
This menu is referred to as the editing menu. When you make this menu visible, UIMenuController positions it relative to a target rectangle on the screen; this rectangle usually defines a selection. The menu appears above the target rectangle or, if there is not enough space for it, below it.
You can also provide your own menu items via the menuItems property. When you modify the menu items, you can use the update method to force the menu to update its display.
One of the cells in my DBTreeListView is bound to a repository item that is a progress bar.
I want to be able to edit the progress displayed by clicking on this cell. At this stage my application should change its cell to another repository item: a text field where I'll be able to insert a value. Once focus is changed to another cell, my progress bar should be displayed again, showing a new value. How do I do this?
DBTreeListView has column events OnGetEditingProperty and OnGetEditProperties. I'll probably use one (or both) of them, but can't come up with any good idea.
This can be simply. You should handle click on this progress bar and display editor over it. You need to handle scrolling and clicking in another place to get rid of editor. And in case that scrolling too far - editor should be hidden.
Steps:
Create hidden editor for progress
Handle OnClick for tree view item
Display editor and set focus
On editor enter (or tab) save progress information
On click on form or another part of tree view - hide editor (saving/discarding changes how specified by your policy)
On scroll tree view move the editor and when bounds of parent does not overlap bounds of editor - hide it
Best regards,
Vladimir
How can i implement an interface like BB Messenger showing a tree with a list of complex field items that are shown only if the tree item expands.??
Use a ListField for the contents of the collapsible area (you control how each row is painted), and use some other focusable field for the header. Add both to a VerticalFieldManager. When you click on the header once, remove the ListField from the Manager. When you click on it again, add it back.
I think you are talking about tree view. for that you can try this.
Create a field to display a tree view
Hello everybody I am trying to create a screen (to see the image click here)
I have set it's backround image also created required list components which are click able by extending Field class. Now my problem is I am not able to set that rounded white color as backround of the list. Please help me. And also because I am new to the blackberry please also tell me the optimized way to create this screen.
i think like this
1) header bar - create manager and embed 2 buttons and 1 label in it
2) bottom bar - create a global class that contains the buttons and define a method that responds to the click event of these buttons
call that class in this main screen
3) for middle part use a list field which is scrollable
I have created a class that extends HorizontalFieldManager so that I can display a label and an image on the same line with the label to the left and the image to the right. I want the user to be able to interact with the hfm as if it were a single field. I have everything working (focus, click action, etc) except the menu. When I press the menu button makeMenu and makeContextMenu are not called. How do I make it so that the correct menu shows when the menu button is clicked and focus is on the hfm? Am I going about this the wrong way?
Where do you override makeContextMenu, in the Hfm? You might have to override them in the label and image.
Or, less elegantly, you could just check in the makeMenu() function of your screen if the hfm has focus (or its children) and then add your menu item there.