Inside Macintosh: Macintosh Toolbox Essentials /

Chapter 5 - Control Manager

Using the Control Manager

To implement a control, you generally

• use a control resource (that is, a resource of type 'CNTL') to describe the control
• create and display the control
• determine when the user presses, clicks, or holds down the mouse button while the cursor is in the control
• respond as appropriate to events involving the control--for example, by displaying a different portion of the document when the user manipulates a scroll bar
• respond as appropriate to other events in windows that include controls--for example, by moving and resizing a scroll bar when the user resizes a window, or by hiding one window's scroll bars when the user makes a different window active

These tasks are explained in greater detail in the rest of this chapter.

Before using the Control Manager, you must initialize QuickDraw, the Font Manager, and the Window Manager, in that order, by using the InitGraf, InitFonts, and InitWindows procedures. (See Inside Macintosh: Imaging for information about InitGraf and InitFonts; see the chapter "Window Manager" in this book for information about InitWindows.)

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Subtopics

Creating and Displaying a Control

Responding to Mouse Events in a Control

Determining and Changing Control Settings

Scrolling Through a Document

Moving and Resizing Scroll Bars

Defining Your Own Control Definition Function