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Jakub Chrzanowski 2020-08-12 15:37:38 +02:00
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4
basics/action_system.md
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@ -85,7 +85,7 @@ See [Grouping Actions](#grouping-actions) for more information about the `compac
> **NOTE** If an action is added to a toolbar, its `update()` can be called if there was any user activity or focus transfer. > **NOTE** If an action is added to a toolbar, its `update()` can be called if there was any user activity or focus transfer.
If the action's availability changes in the absence of these events, then call [`ActivityTracker.getInstance().inc()`](upsource:///platform/platform-api/src/com/intellij/ide/ActivityTracker.java) to notify the action subsystem to update all toolbar actions. If the action's availability changes in the absence of these events, then call [`ActivityTracker.getInstance().inc()`](upsource:///platform/platform-api/src/com/intellij/ide/ActivityTracker.java) to notify the action subsystem to update all toolbar actions.
An example of enabling a menu action based on whether a project is open is demonstrated in [`PopupDialogAction.update()`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) method. An example of enabling a menu action based on whether a project is open is demonstrated in [`PopupDialogAction.update()`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) method.
### Overriding the AnAction.actionPerformed Method ### Overriding the AnAction.actionPerformed Method
When the user selects an enabled action, be it from a menu or toolbar, the action's `AnAction.actionPerformed()` method is called. When the user selects an enabled action, be it from a menu or toolbar, the action's `AnAction.actionPerformed()` method is called.
@ -98,7 +98,7 @@ The code that executes in the `AnAction.actionPerformed()` method should execute
<!-- TODO: does this all happen inside a transaction? Does that ensure the undo step? --> <!-- TODO: does this all happen inside a transaction? Does that ensure the undo step? -->
An example of inspecting PSI elements is demonstrated in the SDK code sample `action_basics` [`PopupDialogAction.actionPerformed()`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) method. An example of inspecting PSI elements is demonstrated in the SDK code sample `action_basics` [`PopupDialogAction.actionPerformed()`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) method.
### Action IDs ### Action IDs
Every action and action group has a unique identifier. Every action and action group has a unique identifier.

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basics/architectural_overview/navigating_psi.md
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@ -65,4 +65,4 @@ PsiClass containingClass = containingMethod.getContainingClass();
``` ```
To see how the navigation works in practice, please refer to the To see how the navigation works in practice, please refer to the
[code sample](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/psi_demo/src/main/java/org/intellij/sdk/psi/PsiNavigationDemoAction.java). [code sample](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/psi_demo/src/main/java/org/intellij/sdk/psi/PsiNavigationDemoAction.java).

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reference_guide/project_model/library.md
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@ -76,7 +76,7 @@ To create a library, perform the following steps:
* For a module-level library, commit the modifiable model returned by `ModuleRootManager.getInstance(module).getModifiableModel()`. * For a module-level library, commit the modifiable model returned by `ModuleRootManager.getInstance(module).getModifiableModel()`.
For module-level libraries, you can also use simplified APIs in the [`ModuleRootModificationUtil`](upsource:///platform/projectModel-api/src/com/intellij/openapi/roots/ModuleRootModificationUtil.java) class to add a library with a single API call. For module-level libraries, you can also use simplified APIs in the [`ModuleRootModificationUtil`](upsource:///platform/projectModel-api/src/com/intellij/openapi/roots/ModuleRootModificationUtil.java) class to add a library with a single API call.
You can find an example of using these APIs in the [project_model](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/project_model/src/main/java/org/intellij/sdk/project/model/ModificationAction.java) code sample. You can find an example of using these APIs in the [project_model](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/project_model/src/main/java/org/intellij/sdk/project/model/ModificationAction.java) code sample.
### Adding Contents or Modifying a Library ### Adding Contents or Modifying a Library
To add or change the roots of a library, you need to perform the following steps: To add or change the roots of a library, you need to perform the following steps:
@ -105,12 +105,12 @@ You can use the following methods:
ProjectFileIndex.isInLibrarySource(virtualFileorDirectory) ProjectFileIndex.isInLibrarySource(virtualFileorDirectory)
``` ```
See the [project_model](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/project_model/src/main/java/org/intellij/sdk/project/model/ProjectFileIndexSampleAction.java) to see how the method mentioned above can be applied. See the [project_model](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/project_model/src/main/java/org/intellij/sdk/project/model/ProjectFileIndexSampleAction.java) to see how the method mentioned above can be applied.
More details on libraries can be found in the [plugin_model](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/project_model/src/main/java/org/intellij/sdk/project/model/LibrariesAction.java) code sample. More details on libraries can be found in the [plugin_model](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/project_model/src/main/java/org/intellij/sdk/project/model/LibrariesAction.java) code sample.
## Predefined Libraries ## Predefined Libraries
EP: `com.intellij.additionalLibraryRootsProvider` EP: `com.intellij.additionalLibraryRootsProvider`
[`AdditionalLibraryRootsProvider`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/AdditionalLibraryRootsProvider.java) [`AdditionalLibraryRootsProvider`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/AdditionalLibraryRootsProvider.java)
Allows providing synthetic/predefined libraries ([`SyntheticLibrary`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/SyntheticLibrary.java)) in a project without exposing them in the model. By default, they're also hidden from UI. Allows providing synthetic/predefined libraries ([`SyntheticLibrary`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/SyntheticLibrary.java)) in a project without exposing them in the model. By default, they're also hidden from UI.

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reference_guide/project_model/project.md
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@ -76,7 +76,7 @@ See [SDK](sdk.md) for more details.
Utility classes used for modifying the project structure can be found in the package [`projectModel-impl.openapi`](upsource:///platform/projectModel-impl/src/com/intellij/openapi). Its [`roots`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/) subpackage contains instances and utilities intended for work with project and module source roots, including [`ModuleRootModificationUtil`](upsource:///platform/projectModel-api/src/com/intellij/openapi/roots/ModuleRootModificationUtil.java) and [`ProjectRootUtil`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/projectRoots/impl/ProjectRootUtil.java). Project structure Utility classes used for modifying the project structure can be found in the package [`projectModel-impl.openapi`](upsource:///platform/projectModel-impl/src/com/intellij/openapi). Its [`roots`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/roots/) subpackage contains instances and utilities intended for work with project and module source roots, including [`ModuleRootModificationUtil`](upsource:///platform/projectModel-api/src/com/intellij/openapi/roots/ModuleRootModificationUtil.java) and [`ProjectRootUtil`](upsource:///platform/projectModel-impl/src/com/intellij/openapi/projectRoots/impl/ProjectRootUtil.java). Project structure
changes need to be performed in a [write action](/basics/architectural_overview/general_threading_rules.md#readwrite-lock). changes need to be performed in a [write action](/basics/architectural_overview/general_threading_rules.md#readwrite-lock).
Refer to the [project_model](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/project_model/src/main/java/org/intellij/sdk/project/model/ModificationAction.java) code sample to learn how project structure modification can be implemented. Refer to the [project_model](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/project_model/src/main/java/org/intellij/sdk/project/model/ModificationAction.java) code sample to learn how project structure modification can be implemented.
## Receiving Notifications About Project Structure Changes ## Receiving Notifications About Project Structure Changes
To receive notifications about changes in project structure (modules or libraries being added or removed, module dependencies being changed, and so on), use the [message bus](/reference_guide/messaging_infrastructure.md) and the `ProjectTopics.PROJECT_ROOTS` topic: To receive notifications about changes in project structure (modules or libraries being added or removed, module dependencies being changed, and so on), use the [message bus](/reference_guide/messaging_infrastructure.md) and the `ProjectTopics.PROJECT_ROOTS` topic:

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tutorials/action_system/grouping_action.md
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@ -35,7 +35,7 @@ See [Registering Actions in plugin.xml](/basics/action_system.md#registering-act
### Binding Action Groups to UI Components ### Binding Action Groups to UI Components
The following sample shows how to use an `<add-to-group>` element to place a custom action group relative to an entry in the **Tools** menu. The following sample shows how to use an `<add-to-group>` element to place a custom action group relative to an entry in the **Tools** menu.
The attribute `relative-to-action` references the action `id` for `PopupDialogAction`, which is not a native IntelliJ menu entry. The attribute `relative-to-action` references the action `id` for `PopupDialogAction`, which is not a native IntelliJ menu entry.
Rather `PopupDialogAction` is defined in the same [`plugin.xml`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/resources/META-INF/plugin.xml) file. Rather `PopupDialogAction` is defined in the same [`plugin.xml`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/resources/META-INF/plugin.xml) file.
This group is placed after the single entry for the action `PopupDialogAction`, as defined in the tutorial [Creating Actions](working_with_custom_actions.md#registering-an-action-with-the-new-action-form). This group is placed after the single entry for the action `PopupDialogAction`, as defined in the tutorial [Creating Actions](working_with_custom_actions.md#registering-an-action-with-the-new-action-form).
```xml ```xml
@ -94,7 +94,7 @@ to create the `CustomDefaultActionGroup` class in the `action_basics` code sampl
``` ```
### Registering the Custom Action Group ### Registering the Custom Action Group
As in the case with the static action group, the action `<group>` should be declared in the `<actions>` section of the `plugin.xml` file, for example, the [action_basics](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/resources/META-INF/plugin.xml) plugin. As in the case with the static action group, the action `<group>` should be declared in the `<actions>` section of the `plugin.xml` file, for example, the [action_basics](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/resources/META-INF/plugin.xml) plugin.
The declaration below shows: The declaration below shows:
* The presence of the `class` attribute in the `<group>` element, which tells the IntelliJ Platform framework to use `CustomDefaultActionGroup` rather than the default implementation. * The presence of the `class` attribute in the `<group>` element, which tells the IntelliJ Platform framework to use `CustomDefaultActionGroup` rather than the default implementation.
* Setting the group's `popup` attribute to allow submenus. * Setting the group's `popup` attribute to allow submenus.
@ -152,7 +152,7 @@ The set of actions in the `ActionGroup` is dynamically defined.
### Creating Variable Action Group ### Creating Variable Action Group
To create a group of actions with a variable number of actions, extend `ActionGroup`. To create a group of actions with a variable number of actions, extend `ActionGroup`.
For example, as in the `action_basics` class [`DynamicActionGroup`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/java/org/intellij/sdk/action/DynamicActionGroup.java) code: For example, as in the `action_basics` class [`DynamicActionGroup`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/java/org/intellij/sdk/action/DynamicActionGroup.java) code:
```java ```java
public class DynamicActionGroup extends ActionGroup { public class DynamicActionGroup extends ActionGroup {
@ -160,7 +160,7 @@ public class DynamicActionGroup extends ActionGroup {
``` ```
### Registering a Variable Action Group ### Registering a Variable Action Group
To register the dynamic menu group, a `<group>` attribute needs to be placed in the `<actions>` section of [`plugin`.xml](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/resources/META-INF/plugin.xml). To register the dynamic menu group, a `<group>` attribute needs to be placed in the `<actions>` section of [`plugin`.xml](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/resources/META-INF/plugin.xml).
When enabled, this group appears at the entry just below the [Static Grouped Actions](#binding-action-groups-to-ui-components) in the **Tools** menu: When enabled, this group appears at the entry just below the [Static Grouped Actions](#binding-action-groups-to-ui-components) in the **Tools** menu:
```xml ```xml

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tutorials/action_system/working_with_custom_actions.md
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@ -19,7 +19,7 @@ Classes that extend it should override `AnAction.update()`, and must override `A
* The `update()` method implements the code that enables or disables an action. * The `update()` method implements the code that enables or disables an action.
* The `actionPerformed()` method implements the code that executes when an action is invoked by the user. * The `actionPerformed()` method implements the code that executes when an action is invoked by the user.
As an example, [`PopupDialogAction`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) overrides `AnAction` for the `action_basics` code sample. As an example, [`PopupDialogAction`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/java/org/intellij/sdk/action/PopupDialogAction.java) overrides `AnAction` for the `action_basics` code sample.
```java ```java
public class PopupDialogAction extends AnAction { public class PopupDialogAction extends AnAction {
@ -99,7 +99,7 @@ An action declaration can be added manually to the `plugin.xml` file.
An exhaustive list of declaration elements and attributes is presented in [Registering Actions in plugin.xml](/basics/action_system.md#registering-actions-in-pluginxml). An exhaustive list of declaration elements and attributes is presented in [Registering Actions in plugin.xml](/basics/action_system.md#registering-actions-in-pluginxml).
Attributes are added by selecting them from the **New Action** form, or by editing the registration declaration directly in the plugin.xml file. Attributes are added by selecting them from the **New Action** form, or by editing the registration declaration directly in the plugin.xml file.
The `<action>` declaration for `PopupDialogAction` in the `action_basics` [plugin.xml](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/action_basics/src/main/resources/META-INF/plugin.xml) file. The `<action>` declaration for `PopupDialogAction` in the `action_basics` [plugin.xml](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/action_basics/src/main/resources/META-INF/plugin.xml) file.
It also contains an attribute for an [`Icon`](/reference_guide/work_with_icons_and_images.md) and encloses elements declaring text overrides, keyboard and mouse shortcuts, and to which menu group the action should be added. It also contains an attribute for an [`Icon`](/reference_guide/work_with_icons_and_images.md) and encloses elements declaring text overrides, keyboard and mouse shortcuts, and to which menu group the action should be added.
The full declaration is: The full declaration is:

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tutorials/custom_language_support/language_and_filetype.md
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@ -21,7 +21,7 @@ The `SimpleLanguage` class is defined in the `org.intellij.sdk.language` package
``` ```
## 2.2. Define an Icon ## 2.2. Define an Icon
The [icon](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/simple_language_plugin/src/main/resources/icons/jar-gray.png) for the Simple Language is defined by the `SimpleIcons` class. The [icon](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/simple_language_plugin/src/main/resources/icons/jar-gray.png) for the Simple Language is defined by the `SimpleIcons` class.
There is nothing uniquely Simple Language-specific about [defining the icon](/reference_guide/work_with_icons_and_images.md) itself. There is nothing uniquely Simple Language-specific about [defining the icon](/reference_guide/work_with_icons_and_images.md) itself.
The definition follows a pattern similar to defining, e.g., `SdkIcons`. The definition follows a pattern similar to defining, e.g., `SdkIcons`.

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tutorials/editor_basics/coordinates_system.md
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@ -19,7 +19,7 @@ A keyboard shortcut can also initiate the action.
![Editor Basics Menu](img/basics.png){:width="600px"} ![Editor Basics Menu](img/basics.png){:width="600px"}
The source code for the Java class behind the menu action is [EditorAreaIllustration](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/editor_basics/src/main/java/org/intellij/sdk/editor/EditorAreaIllustration.java). The source code for the Java class behind the menu action is [EditorAreaIllustration](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/editor_basics/src/main/java/org/intellij/sdk/editor/EditorAreaIllustration.java).
The focus of discussion will be the `EditorAreaIllustration.actionPerformed()` method. The focus of discussion will be the `EditorAreaIllustration.actionPerformed()` method.
For more information about creating action classes, see the [Actions Tutorial](/tutorials/action_system.md) which covers the topic in depth. For more information about creating action classes, see the [Actions Tutorial](/tutorials/action_system.md) which covers the topic in depth.

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tutorials/editor_basics/editor_events.md
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@ -22,10 +22,10 @@ The `editor_basics` code sample adds an **Editor Add Caret** menu item to the ed
![Editor Basics Menu](img/basics.png){:width="600px"} ![Editor Basics Menu](img/basics.png){:width="600px"}
### Creating the Menu Action Class ### Creating the Menu Action Class
The source code for the Java action class is [EditorHandlerIllustration](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/editor_basics/src/main/java/org/intellij/sdk/editor/EditorHandlerIllustration.java), a subclass of `AnAction`. The source code for the Java action class is [EditorHandlerIllustration](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/editor_basics/src/main/java/org/intellij/sdk/editor/EditorHandlerIllustration.java), a subclass of `AnAction`.
For more information about creating action classes, see the [Actions Tutorial](/tutorials/action_system.md) which covers the topic in depth. For more information about creating action classes, see the [Actions Tutorial](/tutorials/action_system.md) which covers the topic in depth.
The `EditorHandlerIllustration` action is registered in the _editor_basic_ [`plugin.xml`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/editor_basics/src/main/resources/META-INF/plugin.xml) file. The `EditorHandlerIllustration` action is registered in the _editor_basic_ [`plugin.xml`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/editor_basics/src/main/resources/META-INF/plugin.xml) file.
Note that this action class is registered to appear on the Editor context menu. Note that this action class is registered to appear on the Editor context menu.
```xml ```xml

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tutorials/editor_basics/working_with_text.md
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@ -20,9 +20,9 @@ It may be helpful to open that project in an IntelliJ Platform-based IDE, build
## Creating a New Menu Action ## Creating a New Menu Action
In this example, we access the `Editor` from an action. In this example, we access the `Editor` from an action.
The source code for the Java class in this example is [EditorIllustrationAction](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/editor_basics/src/main/java/org/intellij/sdk/editor/EditorIllustrationAction.java). The source code for the Java class in this example is [EditorIllustrationAction](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/editor_basics/src/main/java/org/intellij/sdk/editor/EditorIllustrationAction.java).
To register the action, we must add the corresponding elements to the `<actions>` section of the plugin configuration file [plugin.xml](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/editor_basics/src/main/resources/META-INF/plugin.xml). To register the action, we must add the corresponding elements to the `<actions>` section of the plugin configuration file [plugin.xml](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/editor_basics/src/main/resources/META-INF/plugin.xml).
For more information, refer to the [Registering Actions](/tutorials/action_system/working_with_custom_actions.md#registering-a-custom-action) section of the Actions Tutorial. For more information, refer to the [Registering Actions](/tutorials/action_system/working_with_custom_actions.md#registering-a-custom-action) section of the Actions Tutorial.
The `EditorIllustrationAction` action is registered in the group `EditorPopupMenu` so it will be available from the context menu when focus is on the editor: The `EditorIllustrationAction` action is registered in the group `EditorPopupMenu` so it will be available from the context menu when focus is on the editor:

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tutorials/framework.md
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@ -7,7 +7,7 @@ The following tutorial shows how to support a custom framework type for a projec
The examples in this tutorial rely heavily on the [framework_basics](https://github.com/JetBrains/intellij-sdk-docs/tree/master/code_samples/framework_basics) code sample. The examples in this tutorial rely heavily on the [framework_basics](https://github.com/JetBrains/intellij-sdk-docs/tree/master/code_samples/framework_basics) code sample.
## 1. Creating a New Framework ## 1. Creating a New Framework
In oder to make a custom framework available and configurable for a project the [`FrameworkTypeEx`](upsource:///java/idea-ui/src/com/intellij/framework/FrameworkTypeEx.java) class needs to be extended, in this example to make the [DemoFramework](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/framework_basics/src/main/java/org/intellij/sdk/framework/DemoFramework.java) class. In oder to make a custom framework available and configurable for a project the [`FrameworkTypeEx`](upsource:///java/idea-ui/src/com/intellij/framework/FrameworkTypeEx.java) class needs to be extended, in this example to make the [DemoFramework](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/framework_basics/src/main/java/org/intellij/sdk/framework/DemoFramework.java) class.
```java ```java
public class DemoFramework extends FrameworkTypeEx { public class DemoFramework extends FrameworkTypeEx {
@ -16,7 +16,7 @@ public class DemoFramework extends FrameworkTypeEx {
## 2. Registering Framework ## 2. Registering Framework
The newly created framework class should be registered as an extension point by adding `com.intellij.framework.type` extension in The newly created framework class should be registered as an extension point by adding `com.intellij.framework.type` extension in
[`plugin.xml`](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/framework_basics/src/main/resources/META-INF/plugin.xml) [`plugin.xml`](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/framework_basics/src/main/resources/META-INF/plugin.xml)
configuration file: configuration file:
```xml ```xml

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tutorials/run_configurations.md
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@ -17,7 +17,7 @@ Create an empty plugin project as described in [Creating a Plugin Project](/basi
## 1. Register a New ConfigurationType ## 1. Register a New ConfigurationType
Add new `configurationType` extension to the Add new `configurationType` extension to the
[plugin.xml](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/run_configuration/src/main/resources/META-INF/plugin.xml) [plugin.xml](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/run_configuration/src/main/resources/META-INF/plugin.xml)
```xml ```xml
<extensions defaultExtensionNs="com.intellij"> <extensions defaultExtensionNs="com.intellij">

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tutorials/tree_structure_view.md
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@ -20,7 +20,7 @@ See
## 1. Register Custom TreeStructure Provider ## 1. Register Custom TreeStructure Provider
Add new *treeStructureProvider* extension to the Add new *treeStructureProvider* extension to the
[plugin.xml](https://github.com/JetBrains/intellij-sdk-docs/blob/master/code_samples/tree_structure_provider/src/main/resources/META-INF/plugin.xml) [plugin.xml](https://github.com/JetBrains/intellij-sdk-code-samples/tree/master/tree_structure_provider/src/main/resources/META-INF/plugin.xml)
```java ```java
<extensions defaultExtensionNs="com.intellij"> <extensions defaultExtensionNs="com.intellij">