Inside Macintosh: Programmer's Guide to MacApp / Part 2 - Working With MacApp

Chapter 28 -
Working With Drag and Drop

This chapter includes recipes and sample code that demonstrate how to

• include and initialize MacApp's drag-and-drop support
• turn on drag-and-drop support for a view
• add drag-and-drop support to a custom view class

MacApp's drag-and-drop support is described in detail in Chapter 9, "Drag and Drop."

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Chapter Contents

Overview

Recipes--Drag and Drop

Recipe--Including and Initializing MacApp's Drag-and-Drop Support

Include MacApp's Drag-and-Drop Code in Your Application

Call the InitUDragManager Initialization Routine

Recipe--Turning on Drag-and-Drop Support for a View

Setting Drag-and-Drop Fields Directly

Setting Drag-and-Drop Fields Using the TDragDropBehavior Class

Recipe--Adding Drag-and-Drop Support to a Custom View Class

Define a Subclass of TView or Another View Class

For a View That Initiates Drags, Override Certain Methods

DoAddDragContent

DoFulfillPromise

For a View That Accepts Drops, Override the WillAcceptDrop Method

Override the DoMakeDragDropCommand Method

Include and Initialize MacApp's Drag-and-Drop Support

Turn on Dragging or Dropping for the View

Override Additional Methods

WillDrag

Override the DoMakeDragCursorRegion or DoMakeDropHiliteRegion Method

Override the DoMakeDragOutlineRegion Method

Setting the Drag Cursor