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| Key bindings |
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| <h3>Key bindings</h3> |
| |
| |
| <p>The association between a command and the key combinations that should |
| invoke the command is called a <b>key binding</b> Plug-ins can define key |
| bindings along with commands in the |
| <a href="../reference/extension-points/org_eclipse_ui_bindings.html">org.eclipse.ui.bindings</a> |
| extension point. From our InfoView example:</p> |
| |
| <pre> |
| <extension |
| point="org.eclipse.ui.bindings"> |
| <key |
| commandId="org.eclipse.ui.examples.contributions.view.edit" |
| contextId="org.eclipse.ui.examples.contributions.view.context" |
| sequence="M1+O" |
| schemeId="org.eclipse.ui.examples.contributions.scheme"> |
| </key> |
| </extension> |
| </pre> |
| |
| |
| <p>The <b>sequence</b> attribute for a key binding defines the key |
| combination that is used to invoke a command. As long as our InfoView |
| context is active, we will try and execute the InfoView edit command when the |
| user chooses <b>CTRL+O</b> and the scheme is set to |
| <b>org.eclipse.ui.examples.contributions.scheme</b>. The mapping of <b>M1</b> to <b>CTRL</b> |
| is described in the extension point description for |
| <a href="../reference/extension-points/org_eclipse_ui_bindings.html">org.eclipse.ui.bindings</a>. |
| </p> |
| <p> |
| The <b>contextId</b> indicates what active context this key binding will |
| be active in. More information on defining contexts declaratively and |
| activating them programmatically can be found in |
| <a href="workbench_advext_contexts.htm" |
| class="XRef">Contexts</a>. In this case, this key binding will be active |
| when the <b>org.eclipse.ui.examples.contributions.view.context</b> context |
| is active. |
| </p> |
| <p> |
| In our InfoView we have code called from the end of createPartControl(Composite):</p> |
| <pre> |
| private static final String VIEW_CONTEXT_ID = "org.eclipse.ui.examples.contributions.view.context"; //$NON-NLS-1$ |
| ... |
| /** |
| * Activate a context that this view uses. It will be tied to this view |
| * activation events and will be removed when the view is disposed. |
| */ |
| private void activateContext() { |
| IContextService contextService = (IContextService) getSite() |
| .getService(IContextService.class); |
| contextService.activateContext(VIEW_CONTEXT_ID); |
| } |
| </pre> |
| |
| <p> |
| As mentioned in <a href="workbench_cmd_handlers.htm" |
| class="XRef">org.eclipse.ui.handlers</a> this context will be active |
| only when the InfoView part is active. It will also be deactivated when |
| the InfoView part is disposed. |
| </p> |
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