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<extension point="orgeclipseuiactionSets"> <actionSet id="orgeclipsecontributionhelloactionSet" label="Hello Action Set"> <action id="orgeclipsecontributionhelloHelloAction" label="Hello"> </action> </actionSet> </extension>
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Each button is supported by an Action, the object that will be invoked when the button is pressed The buttons in the toolbar are grouped into action sets, sets of related actions, as shown inFigure 311 For example, the buttons that create Java elements are an action set The above declaration states that we are contributing a new action set, point="orgeclipseuiactionSets", which contains a single action, labelled "Hello" Note once again that the IDs are globally unique but the names of elements are intended for human consumption
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When we start a new run-time workbench (clicking the Running Guy will rerun what was run previously), we can see our action set in Window > Customize Perspective > Other as shown in Figure 312
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Notice that the values of the label elements in the declaration are used to present our contribution to the user Selecting our action set and clicking OK doesn't cause a button to appear Why To appear as a button, each action has to be associated with a toolbar path, a hint to Eclipse as to where to put the action In our case, we don't want to put the action near any other particular actions, so we can make up a toolbar path:
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<action id="orgeclipsecontributionhelloHelloAction" label="Hello" toolbarPath="helloGroup"> </action> If there were already actions with the toolbar path helloGroup, our Hello action would appear nearby Since this action is the only one with
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this toolbar path, our button appears in a group by itself Because we didn't specify an icon, the button appears as the default red square, as shown in Figure 313
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Figure 313 Our Button Appears as a Red Square
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The button placement behavior leads us to the Sharing Rule: SHARING RULE Add, don't replace When you contribute to Eclipse, your contributions will be added to the contributions already in place There isn't a way to replace existing functionality It's your job to find a way to think of your contribution as an addition to the existing functionality and it's Eclipse's job to harmoniously combine the contributions Before we implement the functionality behind the button, notice that we have been able to present our contribution to the user purely declaratively The manifest defines how the contribution appears; the Java code defines how it behaves
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33 Saying "Hello"
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We have finished the user-visible appearance of our plug-in Now it is time to fill in the implementation side, actually opening a dialog containing the string "Hello" According to the Lazy Loading Rule, contributions are only loaded when they are first invoked Eclipse waits until the button is clicked, then looks for code to invoke The code is represented as a Java class, so the name of the class has to be part of the definition of the action
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Figure 314 The Appearance Is Finished, Now the Implementation
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Each action has the name of a Java class associated with it When the action is invoked, an instance of that class is created to process the button click The Java class is represented as an element of the action declaration:
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<action id="orgeclipsecontributionhelloHelloAction" label="Hello" toolbarPath="helloGroup" class="orgeclipsecontributionhelloHelloAction"> </action> When we start the run-time workbench and click our button, the console in the host workbench (the one where we are developing the
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plug-in) tells us that the class can't be found:
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Could not create action delegate for id: orgeclipsecontribution helloHelloAction Reason: Plug-in orgeclipsecontributionhello was unable to load class orgeclipsecontribution helloHelloAction To make the action work, we need to create a class called orgeclipsecontributionhelloHelloAction How will the action be invoked [1] Eclipse needs a protocol common to all actions This protocol is defined in the interface IWorkbenchWindowActionDelegate As an extender you are required to conform to this interface, the Conformance Rule (see Figure 315):
The convention in Eclipse is to name interfaces beginning with an "I"