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--- jvx:client:gui:checkbox [2018/02/01 13:39]
admin
+++ jvx:client:gui:checkbox [2020/06/26 11:53] (current)
cduncan
@@ Line 1: / Line 1: @@
 ~~NOTRANS~~
-~~Title: Work with ChoiceCellEditors instead of Checkboxes~~
+~~Title: Work With Checkboxes~~
-JVx has checkboxes defined with ICheckbox, but such checkboxes are not automatically bound to the model. It's possible to bind checkboxes manually and update the state after value changed events. If you need a checkbox automatically bound to the model an IChoiceCellEditor is the class to use.
+If you need native checkboxes that are automatically bound to your model, instead of fake [[jvx:client:gui:checkbox|"ChoiceCellEditor checkboxes"]], you can use UICheckBoxCellEditor.
-The choice cell editor is not a real checkbox, it is a cell editor that has a list of values and shows an image instead of the value. It's very easy to use it as checkbox, because the only things you need are two images. One image for checked state and one for unchecked state. You can e.g. use YES/NO, Y/N, TRUE/FALSE as checked/unchecked values. The choice cell editor is very powerful because it offers multi-state checkboxes. This is what you need if you develop database applications, because two states are not enough.
+However, be aware that such native checkboxes only have two states and two values (selected or unselected, e.g., Y or N). You can't set a custom value for null/empty, but this would be possible with UIChoiceCellEditor.
-== How to use the choice cell editor? ==
+The advantage of native checkboxes is that they will fit your look and feel, but this would be also possible with custom images and choice cell editors.
-There are more options, but the easiest one is to set the cell editor for the column:
+== Usage ==
+The syntax is similar to [[jvx:client:gui:checkbox|ChoiceCellEditors]], e.g.:
 <file java>
 rowDef.getColumnDefinition("CHOOSE").getDataType().
-                                           setCellEditor(ApplicationUtil.YESNO_EDITOR);
+                                           setCellEditor(ApplicationUtil.YESNO_CHECKBOX);
 </file>
-The ApplicationUtil defines default cell editors. The YESNO_EDITOR is defined as:
+The ApplicationUtil defines default cell editors. The YESNO_CHECKBOX is defined as:
 <file java>
-new UIChoiceCellEditor(new Object [] {"Y", "N"},
+new UICheckBoxCellEditor("Y", "N");
-                       new String [] {UIImage.CHECK_YES_SMALL, UIImage.CHECK_SMALL},
-                       UIImage.CHECK_SMALL);
 </file>
-It's also possible to define default choice cell editors for an application:
+It's also possible to define default checkbox cell editors for an application:
 <file java>
-UIChoiceCellEditor.addDefaultChoiceCellEditor(ApplicationUtil.YESNO_EDITOR);
+UICheckBoxCellEditor.addDefaultCheckBoxCellEditor(ApplicationUtil.YESNO_CHECKBOX);
-</java>
+</file>
-A default choice cell editor will be set automatically, for a column, if the metadata of the column defines allowed values. Allowed values could be set via check constraints in the database or via setAllowedValues in the column metadata.
-It works great if you use check constraints, enums or sets in your database, for specific columns, together with default choice cell editors. You don't need extra source code to show "checkboxes". Everything will be auto-configured.