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Transition Plug-ins

Transition plug-ins allow the user to select a visual display that eases an otherwise potentially jarring change from one clip to another. Typical transitions are wipes, fades, and dissolves.

A transition is applied between clips; it cannot apply across multiple clips as a title can.

Obtaining User’s Direction Choice

The HYPluginDirection enumeration defines five values for the user-selected direction:

• kPluginDirectionNone

• kPluginDirectionUp

• kPluginDirectionDown

• kPluginDirectionLeft

• kPluginDirectionRight

For example, if the user clicks the right arrow, iMovie provides kPluginDirectionRight value in HYPluginTitleInfo.direction. The plug-in can also supply HYPluginGetInfo.defaultDirection to iMovie so it can set the arrow to the desired default when the plug-in is initially chosen.

The HYPluginTransitionInfo structure is returned to the plug-in when it makes the GetTransitionInfo callback. The speed member contains the setting for the Speed slider in the transitions pane; its value can be in the range 0.0–1.0. The ver2 member is defined in the HYPluginTransitionInfo structure shown in Listing 1-6.

Listing 1-6  HYPluginTransitionInfo structure

// HYPluginTransitionInfo

typedef struct _HYPluginTransitionInfo {

    float speed;

    HY2PluginTransitionInfo ver2;

} HYPluginTransitionInfo;

The HY2PluginTransitionInfo structure is used only to extend HYPluginTransitionInfo. It was introduced with iMovie 2.0 to provide the direction member.

Listing 1-7  HY2PluginTransitionInfo structure

typedef struct _HY2PluginTransitionInfo {

    HYPluginDirection direction;

} HY2PluginTransitionInfo;

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