Is there any sample code or article/guide suggesting how to best implement a click+scroll feature as common in apps like Adobe XYZ, Pixelmator, ..:
The user clicks in a view while holding down the Space key to scroll the view
Should we just move the containing scroll view every time the mouse moves by the delta amount since the previous mouse moved event?
Is there any built-in functionality in NSScrollView that we can hook up to in order to perform the click-&-drag scrolling?
Or should we simulate clicking&dragging the scrollbar via the NSScroller APIs?
Any hints appreciated!
Not looking for sample code to copy&paste here, more what's the best/most compatible/least code strategy!
Related
Alright here is my issue. I have a Pivot view. Inside that pivot view a scroll viewer containing many stack panels and grids. On some of the grids I have MouseButton Up Events. What is happening is if I flick the scroll it scrolls as expected but when I release my finger most of the time it fires off the event from mousebutton up. Because technically I let up. The problem is these grids completely fill the screen so finding an area without a mousebutton up to scroll is near impossible. What I want to happen is if the user flicked to scroll I would ideally like it to ignore the mousebutton up event. It does this successfully sometimes but pretty rarely and I have noticed I have to flick pretty fast for it to work as expected.
Any ideas on how to prevent this activity. I assume there is as Listboxes work perfect.
i think u should use windows phone toolkit GestureListener to recognize flick event
I ended up setting a bool for when the scrollviewer was scrolling and based on that allowing the mouseup action to run my code. Here is the the site I used to implement the bool based on scrolling status.
http://blogs.msdn.com/b/ptorr/archive/2010/07/23/how-to-detect-when-a-list-is-scrolling-or-not.aspx
I have a NSTrackingArea to determine whether I should show a close "button" in my view. I would like to show a rollover image.
What is better,
Actually using a button ( as a subview ) instead of drawing my own thing, then adding another tracking area to the button and then showing the rollover image..
Using a second NSTrackingArea to determine when the mouse is on top of the close button so I can show the rollover image.
I personally think the second one is easier, the only thing that I would have to do extra what the button would do for me is implementing a click action.
Use whichever approach is simplest for you to implement. It is extremely unlikely that either will cause any performance problems (NSTrackingArea is already highly optimized.)
I am wanting to implement history navigation in my app that mimics the slide away animation found in Safari on Lion and in XCode where a top view slides away at the speed of swipe to reveal the view underneath it.
I was looking for pointers on how to do this. I know how to detect the swipe. I assume I could implement the animation via a CALayer animation slide transition on the top view revealing a view underneath it. Has anybody else done this and can offer some further pointers?
It's a new NSEvent method, -trackSwipeEventWithOptions:.... You should call it from within your regular scroll/swipe event handler, whenever you decide the gesture should begin. Unfortunately it doesn't automatically handle the page animations — it just gives you updates with the gesture amount, and you have to do the animations yourself (using layers or views or somesuch). You'll probably want to save images of each page so you can animate them around during a gesture.
If you tap on the left hand side of the screen in Outlook then an event is triggered (in this case a checkbox appears).
I would like to know the xaml on how this is achieved. It cannot be a simple "MouseLeftButtonUp" event because if you drag your finger more than a few pixels then the event does not trigger.
In my own app I am trying to get an icon appear within a listbox that has a SelectionChanged event. The issue is that if you do not touch the small icon precisely then you are triggering the listbox event rather than the event I want to occur when pressing the image.
I think I need to wrap my image in a Canvas but then am still stuck as to what the event should be.
How do you increase the target size of the area where a user can click on your element?
What event should an image have when within a listbox (which is within a pivot) that has a SelectionChanged event? (MouseLeftButtonUp causes issues if you half drag to the next pivot and lift your finger - it triggers the MouseLeftButtonUp event)
I implemented something very similar to that behavior by making an itemtemplate where the checkbox was pushed offscreen to the left by using a negative margin.
I then created 2 visual states, one for Open and Closed. The open state set the margin to 0, bringing the checkbox back onscreen. Closed state had the negative margin.
With the fluidmove behavior, switching between states on button press was EASY. The only thing you'd have to add would be an invisible button/touch area on the left that would also trigger "opening" the checkbox column (changing state to reset the margins).
Hope that helps...
The outlook app is a native app, so it probably isn't using xaml at all.
If you're worried about the mouse events, then you should look at the gesture stuff in the silverlight toolkit, it contains tap, etc events that make a little more sense on the phone.
Increasing the target size and generally making stuff touchable: wrap it in a Button, then alter the ControlTemplate for the Button to remove the border.
If you look at the ControlTemplate for a Button, (Expression Blend, Edit Template, Edit a copy) you'll see the mechanics of the touch area. It's nothing more than padding/margin.
Thus, you can't bleed your touch region out without altering the layout and affecting other items around the control. I'd do two things:
First, I'd think about whether my whole control should be larger in the first place with good spacing around it. Is my design right?
Second, I'd cheat. I'd float a fixed sized button with no border over the area using the Translate transformation to move it around freely.
Good luck,
Luke
I am using a custom panel as a ItemsPanel for a ItemsControl in a with a custom template that provides for a scroll viewer. (See Xaml below.) So long as my panel does not implement IScrollInfo, scrolling works in this scenerio.
I implement IScrollInfo and update my viewport and extent sizes in measure override. The scroll bar shows the correct relative size, and if I call the IScrollInfo methods directly, scrolling works as expected. However, the drag and flick gestures no longer scroll the content. Putting a breakpoint on the input of every IScrollInfo method shows that drag and pick are not calling the interface. Removing the IScrollInfo interface declaration restores the scroll on drag and flick behavior.
Is there a simple way to restore the flick and pan gestures to ItemControls with panels that implement IScrollInfo?
An unfortunate answer I received from Eric Sink, A MSFT forum moderator.
I believe that what is happening is that, when you inherit from
IScrollInfo, your panel takes over all of the scroll functionality but
we use an internal interface, as martin mentioned, to control the
flick animation. Since your object does not inherit from this
interface the underlying code will bypass this functionality.
I think that you should still be able to override the OnManipulation*
events and setup your own storyboard animation.
It sounds like if you want to do IScrollInfo, you're on your own for the manipulation.