All Databases Inside Mac - Basic Toolbox

GrowWindow

Track mouse for sizing a window

#include <Windows.h> Window Manager

long GrowWindow( theWindow, startPoint, sizeRect );

WindowPtr theWindow ; window to resize

Point startPoint ; position of a mouseDown (global coordinates)

Rect *sizeRect ; minimum and maximum size

returns hiword=new height; loword=new width

GrowWindow draws a "grow image" of the window and tracks the mouse as

the user changes the window's size. It sets limits for the operation and

returns the new size. It does not redraw the window.

theWindow identifies the window being resized. It is normally a WindowPtr

obtained via FindWindow after a mouseDown event.

startPoint is a Point, in global coordinates. It is normally the where field of an

EventRecord that indicated a mouseDown event in the grow region

(size box) of the window.

sizeRect is the address of an 8-byte Rect structure. It identifies the limits

within which the user will be allowed to size the window. Each field

of the structure specifies a size in pixels, defined as:

sizeRect.top minimum height of the window

sizeRect.bottom maximum height of the window

sizeRect.left minimum width of the window

sizeRect.right maximum width of the window

Returns: a long integer identifying the new size - as outlined by the grow

image - when the mouse is released. A return value of 0 indicates no

change. Otherwise, the long is defined as two 16-bit words as

follows:

high word indicates the new height of the window

low word indicates the new width

Notes: As with DragWindow, this function tracks the mouse while drawing an

outline image of the window. However, this function does not redraw the

screen in its new size (use SizeWindow to redraw the screen).

Typical usage for a document window involves the following steps:

GetNextEvent look for a mouse-down

FindWindow get mouse point (returns inGrow)

SetRect build a Rect that specifies min/max limits

GrowWindow let the user select new size (returns non-zero)

SizeWindow to height & width returned from GrowWindow

InvalRect force screen update

MoveControl

SizeControl

ShowControl reposition and redraw the scroll bar(s)

. . . reflow text, etc.

The global variable screenBits (a BitMap structure) may help you decide

what values to use in sizeRect :

screenBits.bounds.right is the maximum width of the screen

screenBits.bounds.bottom is the maximum height of the screen

The Toolbox utility functions LoWord and HiWord are handy for breaking

the GrowWindow return value into its components.