Perl: The Complete Reference in Objective-C

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Perl: The Complete Reference
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The grid geometry manager uses a simple table layout, as you might use within a word processor or when designing web pages with HTML Each widget is placed into a table cell, and you specify its location by defining the row and column in which the widget should appear Individual widgets can span multiple rows and columns if necessary As with the placer geometry manager, you will need to give some careful thought to how to lay out your widgets in this system The packer geometry manager is the one we ve been using in this chapter, and it s the most practical if you do not want to think too much about the geometry management process As such, it s the one we ll pay the most attention to in this chapter If you want details on the systems, please see the documentation that comes with the Perl/Tk module
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The packer geometry manager is similar to Motif s Form widget and uses a much simpler system for defining the location of widgets within a frame of a window Remember that the pack function is just that it only provides the algorithm used to organize the layout of widgets Individual calls to the pack method pack the corresponding widget into the next available space within the frame or window This means that widgets are added to the window or frame in the order in which they are packed This is similar to how you would pack a bag or fill a shelf: you start from a single point and add items until the space is all used up The algorithm works like this: 1 Given a frame, the packer attaches a widget to a particular side (top, bottom, left, or right) 2 The space used up by the widget is taken off from the space available in the frame, an area called the parcel If the widget does not fill the parcel completely (if the parcel is wider or taller than the area sliced for the widget), then that space is essentially wasted This is, in fact, the reason for supporting additional Frame widgets to make the best use of the space 3 The next widget is then placed into the remaining space, and once again the widget can attach itself to the top or bottom or one of sides to use up the available space 4 Note that all widgets that specify a particular anchor point will be grouped together and share that space Thus, if you specify multiple widgets with left anchor, they will be organized left-to-right within the frame Once again, if you want to do more complex layouts (as in the Scale widget example), you will need to create separate frames The available options to the packer method are shown in Table 17-15 Like other elements of the Tk system, options are specified as a hash to the pack method If you do not specify an option, the packer geometry manager inserts widgets from top to bottom
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The side of the frame to which the widget should be added Should be one of left, right, top, or bottom Specifies whether the widget should fill up the space in the parcel in the x or y direction You can also specify both, to fill in both directions, or none, to prevent filling altogether The ipadx or ipady options can be used to specify some additional blank padding space around the widget within the parcel Specifies whether the widget should expand to take up all of the remaining space after the other widgets have been placed This is useful for Textbox widgets where you are defining an outer menu and toolbar and want the main widget to take up all the remaining space The spacing between widgets, specified in pixels, millimeters, inches, or points (see also Table 17-16) The spacing around a widget that is filling the space provided by the parcel; specified in pixels, millimeters, inches, or points (see also Table 17-16)
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