PF_EventUnion

The PF_EventUnion in PF_EventExtra is a union of the four following structures.

Click

A mouse click or drag occurred within the custom UI’s area.

PF_DoClickEventInfo

Member	Purpose
`when`	The (OS-level) time at which the click occurred.
`screen_point`	Where, in screen coordinates, the click occurred. For Custom Comp UI, these coordinates can be converted to composition coordinates using the UI Callbacks.
	See the CCU sample project for an example.
`num_clicks`	The number of clicks that occurred.
`modifiers`	Which modifier keys (if any) were held down during click.
`continue_refcon[4]`	An array of 4 `A_intptr_t` the plug-in can use to store information during a click-drag-drag sequence.
`send_drag`	Set this flag to `TRUE` to indicate continued dragging. The next click event will then effectively be a drag event.
`last_time`	Set when the drag event ends (the user has released the mouse button).

Draw

After Effects needs your custom UI to refresh.

Note: when handling draw requests, use the image dimensions provided in PF_InData (rather that the dimensions of your input layer, as you would during PF_Cmd_RENDER).

PF_DrawEventInfo

Member	Purpose
`update_rect`	The rectangle in which to draw, in the context window’s coordinate system. These coordinates can be converted to different coordinate systems using the UI Callbacks.
	See the CCU sample project for an example.
`depth`	Pixel depth of the drawing context.

Keydown

The user pressed a key, and the effect’s UI is active.

Use the macros in AE_EffectUI.h to access and manipulate the key codes received.

In order to receive keydown events in Premiere Pro, plug-ins must set PF_CustomEFlag_COMP in PF_CustomUIInfo.events during PF_Cmd_PARAM_SETUP.

PF_KeyDownEvent

Member	Purpose
`when`	Time at which the click occurred.
`screen_point`	Screen coordinate of the mouse pointer when the key was pressed.
	For Custom Comp UI, these coordinates can be converted to composition coordinates using the UI Callbacks.
	See the CCU sample project for an example.
`key_code`	Either a character code (for printable characters, we use the unshifted upper case version; A not a, 7 not &), or a control code:
	- `PF_ControlCode_Unknown`
	- `PF_ControlCode_Space`
	- `PF_ControlCode_Backspace`
	- `PF_ControlCode_Tab`
	- `PF_ControlCode_Return`
	- `PF_ControlCode_Enter`
	- `PF_ControlCode_Escape`
	- `PF_ControlCode_F1`
	- …
	- `PF_ControlCode_F24`
	- `PF_ControlCode_PrintScreen`
	- `PF_ControlCode_ScrollLock`
	- `PF_ControlCode_Pause`
	- `PF_ControlCode_Insert`
	- `PF_ControlCode_Delete`
	- `PF_ControlCode_Home`
	- `PF_ControlCode_End`
	- `PF_ControlCode_PageUp`
	- `PF_ControlCode_PageDown`
	- `PF_ControlCode_Help`
	- `PF_ControlCode_Clear`
	- `PF_ControlCode_Left`
	- `PF_ControlCode_Right`
	- `PF_ControlCode_Up`
	- `PF_ControlCode_Down`
	- `PF_ControlCode_NumLock`
	- `PF_ControlCode_Command`
	- `PF_ControlCode_Option`
	- `PF_ControlCode_Alt` = `PF_ControlCode_Option`
	- `PF_ControlCode_Control`
	- `PF_ControlCode_Shift`
	- `PF_ControlCode_CapsLock`
	- `PF_ControlCode_ContextMenu`
`modifiers`	Which (if any) modifier keys were down during the key press.
	- `PF_Mod_NONE`
	- `PF_Mod_CMD_CTRL_KEY` (cmd on Mac, ctrl on Windows)
	- `PF_Mod_SHIFT_KEY`
	- `PF_Mod_CAPS_LOCK_KEY`
	- `PF_Mod_OPT_ALT_KEY` (option on Mac, alt on Windows)
	- `PF_Mod_MAC_CONTROL_KEY`

AdjustCursor

The cursor has moved onto (but not off of) the effect’s custom UI, to allow the effect to change the cursor.

PF_AdjustCursorEventInfo

Member	Purpose
`screen_point`	Screen coordinate of the mouse pointer. For Custom Comp UI, these coordinates can be converted to composition coordinates using the UI Callbacks.
	See the CCU sample project for an example.
`modifiers`	What, if any, modifier keys were held down when the message was sent.
`set_cursor`	Set this to your desired cursor, or `PF_Cursor_CUSTOM` if you have set the cursor yourself using OS-specific calls. See AE_EffectUI.h for a complete enumeration of built-in cursors.
	If you don’t want to override the cursor, set this to `PF_Cursor_NONE`, or simply ignore this message.

Arbitrary Parameters Event

After Effects needs your plug-in to manage it’s arbitrary data parameter(s).

Though arbitrary data types are not required for custom UI support, PF_ArbParamsExtra follows the EventInfo model.

PF_ArbParamsExtra

Member	Purpose
`which_function`	A `PF_FunctionSelector` indicating which function is called
`id`	Used by After Effects; will match the ID assigned to the arbitrary data type during PF_Cmd_PARAM_SETUP.
`padding`	Used for byte-alignment
u { new_func_params dispose_func_params copy_func_params flat_size_func_params flatten_func_params unflatten_func_params interp_func_params compare_func_params print_size_func_params print_func_params scan_func_params }	(One of these will be passed; see Arbitrary Data Parameters)