124 lines
3.7 KiB
Kotlin
124 lines
3.7 KiB
Kotlin
package net.shadowfacts.cacao
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import net.shadowfacts.cacao.geometry.Point
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import net.shadowfacts.cacao.util.MouseButton
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import net.shadowfacts.cacao.view.View
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import no.birkett.kiwi.Solver
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import java.util.*
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/**
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* A Window is the object at the top of a Cacao view hierarchy. It occupies the entirety of the Minecraft screen size
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* and provides the base coordinate system for its view hierarchy.
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*
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* The Window owns the Kiwi [Solver] object used for layout by all of its views.
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*
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* @author shadowfacts
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*/
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class Window {
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/**
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* The screen that this window belongs to.
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* Not initialized until this window is added to a screen, using it before that point will throw a runtime exception.
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*/
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lateinit var screen: CacaoScreen
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var solver = Solver()
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// _views is the internal, mutable object, since we only want it to be mutated by the add/removeView methods
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private val _views = LinkedList<View>()
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/**
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* The list of top-level views in this window.
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* This list should never be modified directly, only by calling the [addView]/[removeView] methods.
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*/
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val views: List<View> = _views
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private var viewsSortedByZIndex: List<View> = listOf()
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/**
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* Convenience method that removes this window from its [screen].
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*/
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fun removeFromScreen() {
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screen.removeWindow(this)
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}
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/**
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* Adds the given view as a top-level view in this window.
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*
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* @param view The view to add.
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* @return The same view, as a convenience.
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*/
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fun <T: View> addView(view: T): T {
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_views.add(view)
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viewsSortedByZIndex = views.sortedBy(View::zIndex)
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view.window = this
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view.solver = solver
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view.wasAdded()
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return view
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}
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/**
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* Finds all views in this window at the given point.
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*
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* @param point The point to find views at, in the coordinate system of the window.
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* @return All views that contain the point.
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*/
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fun viewsAtPoint(point: Point): List<View> {
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return views.filter { point in it.frame }
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}
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/**
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* Attempts to find a top level view of this window that contains the given point.
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* If there are multiple overlapping views, which one this method returns is undefined.
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* [viewsAtPoint] may be used, and the resulting List sorted by [View.zIndex].
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*
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* @param point The point to find views at, in the coordinate system of the window.
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* @return the Veiw, if any, that contain the given point.
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*/
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fun viewAtPoint(point: Point): View? {
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return views.firstOrNull { point in it.frame }
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}
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/**
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* Instructs the solver to solve all of the provided constraints.
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* Should be called after the view hierarchy is setup.
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*/
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fun layout() {
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solver.updateVariables()
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views.forEach(View::didLayout)
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}
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/**
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* Draws this window and all of its views.
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* This method is called by [CacaoScreen] and generally shouldn't be called directly.
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*
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* @param mouse The point in the coordinate system of the window.
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* @param delta The time elapsed since the last frame.
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*/
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fun draw(mouse: Point, delta: Float) {
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viewsSortedByZIndex.forEach {
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val mouseInView = Point(mouse.x - it.frame.left, mouse.y - it.frame.top)
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it.draw(mouseInView, delta)
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}
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}
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/**
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* Called when a mouse button is clicked and this is the active window.
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* This method is called by [CacaoScreen] and generally shouldn't be called directly.
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*
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* @param point The point in the window of the click.
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* @param mouseButton The mouse button that was used to click.
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* @return Whether the mouse click was handled by a view.
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*/
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fun mouseClicked(point: Point, mouseButton: MouseButton): Boolean {
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val view = viewsAtPoint(point).maxBy(View::zIndex)
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if (view != null) {
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val pointInView = Point(point.x - view.frame.left, point.y - view.frame.top)
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return view.mouseClicked(pointInView, mouseButton)
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}
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return false
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}
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} |