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CHAPTER 4
QR Code Creation In .NET
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The Standard Widget Toolkit
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setImage(Image) Sets the receiver s image to the argument, which may be null, indicating that no image should be displayed setResizable(boolean) Sets the resizable attribute setText(String) Sets the receiver s text setWidth(int) Sets the width of the receiver
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Useful TableItem APIs include:
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getChecked() Returns true if the receiver is checked and false oth-
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getText(int) Returns the text stored at the given column index in the
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receiver, or empty string if the text has not been set
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setBackground(Color) Sets the receiver s background color to the
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color specified by the argument, or to the default system color for the item if the argument is null
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setChecked(boolean) Sets the checked state of the checkbox for this
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setForeground(Color) Sets the receiver s foreground color to the
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color specified by the argument, or to the default system color for the item if the argument is null
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setGrayed(boolean) Sets the grayed state of the checkbox for this
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setImage(Image) Sets the receiver s image to the argument, which may be null, indicating that no image should be displayed setImage(Image[]) Sets the image for multiple columns in the table setImage(int, Image) Sets the receiver s image at a column setImageIndent(int) Sets the image indent setText(int, String) Sets the receiver s text at a column setText(String) Sets the receiver s text setText(String[]) Sets the text for multiple columns in the table
The following example creates a two-column, two-item table Clicking on an item causes the cell s contents to print to the console (see Figure 4 9)
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42 SWT Widgets
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public class TableExample { public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shellsetText("Table Example"); shellsetBounds(100, 100, 200, 100); shellsetLayout(new FillLayout()); final Table table = new Table(shell, SWTSINGLE | SWTBORDER | SWTFULL_SELECTION); tablesetHeaderVisible(true); tablesetLinesVisible(true); TableColumn column1 = new TableColumn(table, SWTNULL); column1setText("Name"); column1pack(); TableColumn column2 = new TableColumn(table, SWTNULL); column2setText("Age"); column2pack(); TableItem item1 = new TableItem(table, SWTNULL); item1setText(new String[] {"Dan", "43"}); TableItem item2 = new TableItem(table, SWTNULL); item2setText(new String[] {"Eric", "44"}); tableaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent event) { TableItem[] selected = tablegetSelection(); if (selectedlength > 0) { Systemoutprintln("Name: " + selected[0]getText(0)); Systemoutprintln("Age: " + selected[0]getText(1)); } } }); shellopen(); while (!shellisDisposed()) { if (!displayreadAndDispatch()) displaysleep(); } displaydispose(); } }
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CHAPTER 4
The Standard Widget Toolkit
Figure 4 9 Table example
The table widget is created with full selection behavior Its headers are made visible with the setHeaderVisble() method and its lines are made visible with the setLinesVisible() method Next, each column is created and its column header is set with the setText() method The pack() method sets the size of each column to the maximum size of its contents Each table row item is created next and cell contents are set with the setText() method (which expects an array of strings, one for each column) Finally, a selection listener is added to the table in which a SelectionAdapter is created that overrides the widgetSelected()method to print any items that are selected
4267 Tree
The tree widget is useful for displaying information in a hierarchical manner A tree consists of a list of items composed of other items, which in turn can be composed of other items, and so on A user navigates through a tree by expanding and collapsing items to view and hide their component items Useful APIs include:
addSelectionListener(SelectionListener) Adds the listener to the collection of listeners that will be notified when the receiver s selection changes by sending it one of the messages defined in the SelectionListener interface addTreeListener(TreeListener) Adds the listener to the collection of listeners that will be notified when an item in the receiver is expanded or collapsed by sending it one of the messages defined in the TreeListener interface deselectAll() Deselects all selected items in the receiver getItemCount() Returns the number of items contained in the receiver that are direct item children of the receiver
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42 SWT Widgets
getItems() Returns the items contained in the receiver that are direct item children of the receiver getSelection() Returns an array of TreeItems that are currently selected in the receiver getSelectionCount() Returns the number of selected items con-
tained in the receiver
removeAll() Removes all the items from the receiver selectAll() Selects all the items in the receiver setSelection(TreeItem[]) Sets the receiver s selection to be the
given array of items
setTopItem(TreeItem) Sets the item that is currently at the top of
the receiver Useful creation styles include:
SWTSINGLE Creates a single-selection tree widget SWTMULTI Creates a multiple-selection tree widget SWTCHECK Creates a checkbox tree widget
Useful TreeItem APIs include:
getChecked() Returns true if the receiver is checked and false oth-