Compose for Desktop: How to Change Mouse Cursor (Without Modifier.pointerIcon)

{"title":"Compose for Desktop: How to Change Mouse Cursor (Without `Modifier.pointerIcon`) ","description":"Learn how to change the mouse cursor in Compose for Desktop, even without the `Modifier.pointerIcon` function, by leveraging the Java AWT library. This guide provides a step-by-step solution with code examples and highlights potential compatibility issues.","keywords":"Compose for Desktop, mouse cursor, cursor, custom cursor, AWT, Toolkit, Java AWT, Gradle dependencies, compatibility issues, Compose UI, UI design, desktop applications","content":"If you want to change the mouse cursor in Compose for Desktop, you can use the `java.awt.Toolkit` class from the Java AWT library. However, it's important to note that using AWT in Compose for Desktop may cause some compatibility issues. \n\nTo change the mouse cursor in Compose for Desktop, you need to follow these steps: \n\n1. First, you need to add the AWT library dependency. In your `build.gradle` file, add the following dependency: \n\nkotlin\n// If you are using Kotlin DSL\ndependencies {\n implementation(\"org.jetbrains.compose:compose-desktop-jvm:1.0.0-alpha2\")\n implementation(\"org.jetbrains.compose:compose-runtime-jvm:1.0.0-alpha2\")\n implementation(\"org.jetbrains.compose:compose-awt-jvm:1.0.0-alpha2\")\n}\n\n// If you are using Groovy DSL\ndependencies {\n implementation \'org.jetbrains.compose:compose-desktop-jvm:1.0.0-alpha2\'\n implementation \'org.jetbrains.compose:compose-runtime-jvm:1.0.0-alpha2\'\n implementation \'org.jetbrains.compose:compose-awt-jvm:1.0.0-alpha2\'\n}\n\n\n2. Then, in your Compose for Desktop application, create a custom mouse cursor that implements the `java.awt.Cursor` interface. For example: \n\nkotlin\nimport java.awt.Cursor\n\nval customCursor = Cursor(Cursor.HAND_CURSOR)\n\n\n3. Finally, in your Compose for Desktop application, use the `java.awt.Toolkit` class's `getDefaultToolkit()` method to get the default toolkit, and use the `createCustomCursor()` method to apply the custom mouse cursor to the application window. For example: \n\nkotlin\nimport androidx.compose.desktop.Window\nimport androidx.compose.runtime.mutableStateOf\nimport androidx.compose.runtime.remember\nimport androidx.compose.ui.input.pointer.pointerIcon\n\nfun main() = Window {\n val cursorState = remember { mutableStateOf(pointerIcon(customCursor)) }\n\n // This is your Compose content\n\n // Apply the mouse cursor\n val toolkit = java.awt.Toolkit.getDefaultToolkit()\n val image = toolkit.createImage(\"\") // This needs an image path, can be an empty string\n val point = java.awt.Point(0, 0) // Mouse cursor position\n val customCursor = toolkit.createCustomCursor(image, point, \"customCursor\")\n toolkit.defaultToolkit().addAWTEventListener(\n MouseCursorListener(cursorState, customCursor),\n AWTEvent.MOUSE_EVENT_MASK\n )\n}\n\n\nIn the above example, `MouseCursorListener` is a custom AWT event listener used to update the mouse cursor when mouse events occur. You can modify it based on your needs. \n\nRemember that using the AWT library in Compose for Desktop may cause some compatibility issues, and this approach may not work in all situations. If you just want to change the mouse cursor in Compose for Desktop, you can consider using other methods, such as using the JavaFX library or using a native solution for Compose for Desktop (if available). \n"}