High-level steps for dragging an image between 2 windows?

[Warty]

Goal: drag a 32x32 graphic from Window 1 to Window 2, allowing for the fact that there could be either/both a screen (background) that has to be traversed, or additional windows from this app or other apps. Goal is to have this work on WB/public screens.

Current status: I am testing with my own screen. I have the graphics set up as interleaved bitmaps + masks, and I can blit them into a window's RastPort.

What would the high level steps look like for doing this?

My super high level is this:
1. user initiates drag in Window 1 by holding down mouse button over an icon
2. user moves mouse to the other window
3. user ends drag by letting up mouse button

+---------------------------------------------------------------+
| +--------------------+                                        |
| | Window 1           |                                        |
| |                    |                                        |
| |                    |                                        |
| |       ++           |                                        |
| |       ++Start Drag |                                        |
| |         X          |                                        |
| |         X          |    +----------------------------+      |
| +---------X----------+    | Window 2                   |      |
|           XX              |                            |      |
|            XXXX           |                            |      |
|               XXXX        |          ++                |      |
|                   XXXXXX  |          ++                |      |
|                        XXXXXXXXXXXXXX  End Drag        |      |
|                           |                            |      |
|                           |                            |      |
|                           |                            |      |
|                           |                            |      |
|                           |                            |      |
|                           |                            |      |
|                           +----------------------------+      |
|                                                               |
|Screen                                                         |
+---------------------------------------------------------------+

Tracking things that are unclear to me:

• How do I get events once the user drags the mouse out into the space between windows? Do I need to have a borderless/titleless backdrop window to catch those events?
• What if I want to do this on the WB screen?
• What if there's another app's windows in between?

Blitter questions
My probably-wrong interpretation of the basic idea of blitter animation:

1. prepare a temp copy of the background space the graphic is "floating on" (without the graphic);
2. make a copy of the (new) space the graphic is going to be moved through
3. restore the copy from #1 to "unstick" the graphic from the background
4. blit the graphic into the new location
5. replace the temp copy of background in #1 with the new copy from #2 so you are ready for the next move.

• Is that approximately right?
• I don't know where user will move mouse next, or how fast/far: does that mean I have to capture a pretty large area of the screen?
• It seems clear from the auto docs that we aren't supposed to access the screen's bitmap directly or 'bad things' will happen. How can I blit across WB background, or across other app's windows?

[nyteshade]

Following this thread.


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[nyteshade]

[mention]thomas [/mention] do you know how to do this?


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