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public FavoritesFilterDialog( Shell parentShell, String namePattern, String locationPattern, FavoriteItemType[] selectedTypes ) { super(parentShell); thisnamePattern = namePattern; thislocationPattern = locationPattern; thisselectedTypes = new HashSet<FavoriteItemType>(); for (int i = 0; i < selectedTypeslength; i++) thisselectedTypesadd(selectedTypes[i]); }
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Next, override the createDialogArea() method to create the various fields that appear in the upper area of the dialog
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private Text namePatternField; private Text locationPatternField; protected Control createDialogArea(Composite parent) { Composite container = (Composite) supercreateDialogArea(parent); final GridLayout gridLayout = new GridLayout(); gridLayoutnumColumns = 2; containersetLayout(gridLayout); final Label filterLabel = new Label(container, SWTNONE); filterLabelsetLayoutData(new GridData(GridDataBEGINNING, GridDataCENTER, false, false, 2, 1)); filterLabelsetText("Enter a filter (* = any number of " + "characters, = any single character)" + "\nor an empty string for no filtering:"); final Label nameLabel = new Label(container, SWTNONE); nameLabelsetLayoutData(new GridData(GridDataEND, GridDataCENTER, false, false)); nameLabelsetText("Name:"); namePatternField = new Text(container, SWTBORDER); namePatternFieldsetLayoutData(new GridData(GridDataFILL, GridDataCENTER, true, false)); final Label locationLabel = new Label(container, SWTNONE); final GridData gridData = new GridData(GridDataEND, GridDataCENTER, false, false); gridDatahorizontalIndent = 20; locationLabelsetLayoutData(gridData); locationLabelsetText("Location:"); locationPatternField = new Text(container, SWTBORDER); locationPatternFieldsetLayoutData(new GridData(GridDataFILL, GridDataCENTER, true, false)); final Label typesLabel = new Label(container, SWTNONE); typesLabelsetLayoutData(new GridData(GridDataBEGINNING, GridDataCENTER, false, false, 2, 1)); typesLabelsetText("Select the types of favorites to be shown:");
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final Composite typeCheckboxComposite = new Composite(container, SWTNONE); final GridData gridData_1 = new GridData(GridDataFILL, GridDataFILL, false, false, 2, 1); gridData_1horizontalIndent = 20; typeCheckboxCompositesetLayoutData(gridData_1); final GridLayout typeCheckboxLayout = new GridLayout(); typeCheckboxLayoutnumColumns = 2; typeCheckboxCompositesetLayout(typeCheckboxLayout); return container; }
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Next create a new createTypeCheckboxes() method, called at the end of the createDialogArea() method, to create one checkbox for each type
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private Map typeFields; protected Control createDialogArea(Composite parent) { existing code createTypeCheckboxes(typeCheckboxComposite); return container; } private void createTypeCheckboxes(Composite parent) { typeFields = new HashMap<FavoriteItemType, Button>(); FavoriteItemType[] allTypes = FavoriteItemTypegetTypes(); for (int i = 0; i < allTypeslength; i++) { final FavoriteItemType eachType = allTypes[i]; if (eachType == FavoriteItemTypeUNKNOWN) continue; final Button button = new Button(parent, SWTCHECK); buttonsetText(eachTypegetName()); typeFieldsput(eachType, button); buttonaddSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { if (buttongetSelection()) selectedTypesadd(eachType); else selectedTypesremove(eachType); } }); } }
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Add the initContent() method that is called at the end of the createDialogArea() method to initialize the various fields in the dialog:
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protected Control createDialogArea(Composite parent) { existing code createTypeCheckboxes(typeCheckboxComposite); initContent(); return container; }
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private void initContent() { namePatternFieldsetText(namePattern != null namePattern : ""); namePatternFieldaddModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { namePattern = namePatternFieldgetText(); } }); locationPatternField setText(locationPattern != null locationPattern : ""); locationPatternFieldaddModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { locationPattern = locationPatternFieldgetText(); } }); FavoriteItemType[] allTypes = FavoriteItemTypegetTypes(); for (int i = 0; i < allTypeslength; i++) { FavoriteItemType eachType = allTypes[i]; if (eachType == FavoriteItemTypeUNKNOWN) continue; Button button = typeFieldsget(eachType); buttonsetSelection(selectedTypescontains(eachType)); } }
Override the configureShell() method to set the dialog title:
protected void configureShell(Shell newShell) { superconfigureShell(newShell); newShellsetText("Favorites View Filter Options"); }
Finally, add accessor methods for clients to extract the settings specified by the user when the dialog was opened:
public String getNamePattern() { return namePattern; } public String getLocationPattern() { return locationPattern; } public FavoriteItemType[] getSelectedTypes() { return selectedTypes toArray(new FavoriteItemType[selectedTypessize()]); }
The filter action (see FavoritesViewFilterAction in Section 734, Pull-down menu, on page 319) must be modified to fill the dialog with the current filter settings, open the dialog, and process the specified filter settings
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if the user closes the dialog using the OK button If the dialog is closed using the Cancel button or any other way besides the OK button, the changes are discarded, per standard dialog operation guidelines The type and location view filters referenced in the following code are left as an exercise for the reader
public void run() { FavoritesFilterDialog dialog = new FavoritesFilterDialog( shell, nameFiltergetPattern(), typeFiltergetTypes(), locationFiltergetPattern()); if (dialogopen() != InputDialogOK) return; nameFiltersetPattern(dialoggetNamePattern()); locationFiltersetPattern(dialoggetLocationPattern()); typeFiltersetTypes(dialoggetSelectedTypes()); }
Getting the preceding run() method to compile involves adding a new FavoritesViewLocationFilter and FavoritesViewTypeFilter similar to the existing FavoritesViewNameFilter When these changes are complete, the filter dialog presents the filter settings to the user when the Filter menu item is selected (see Figure 11 3)