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153 lines
2.6 KiB
153 lines
2.6 KiB
package mightypork.gamecore.gui.screens;
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import mightypork.gamecore.core.App;
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import mightypork.gamecore.gui.events.LayoutChangeEvent;
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import mightypork.gamecore.gui.events.LayoutChangeListener;
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import mightypork.gamecore.input.Edge;
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import mightypork.gamecore.input.KeyBinder;
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import mightypork.gamecore.input.KeyBindingPool;
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import mightypork.gamecore.input.KeyStroke;
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import mightypork.gamecore.render.Renderable;
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import mightypork.utils.annotations.Stub;
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import mightypork.utils.eventbus.clients.BusNode;
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import mightypork.utils.math.constraints.rect.Rect;
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import mightypork.utils.math.constraints.rect.RectBound;
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/**
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* Screen class.
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*
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* @author Ondřej Hruška (MightyPork)
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*/
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public abstract class Screen extends BusNode implements Renderable, RectBound, KeyBinder, LayoutChangeListener {
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private final KeyBindingPool keybindings = new KeyBindingPool();
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private volatile boolean active;
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private volatile boolean needSetupViewport = false;
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public Screen() {
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// disable events initially
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setListening(false);
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addChildClient(keybindings);
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}
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private void fireLayoutChangeEvent()
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{
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App.bus().sendDirectToChildren(this, new LayoutChangeEvent());
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}
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@Override
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public final void bindKey(KeyStroke stroke, Edge edge, Runnable task)
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{
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keybindings.bindKey(stroke, edge, task);
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}
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@Override
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public final void unbindKey(KeyStroke stroke)
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{
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keybindings.unbindKey(stroke);
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}
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/**
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* Prepare for being shown
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*
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* @param shown true to show, false to hide
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*/
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public final void setActive(boolean shown)
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{
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if (shown) {
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active = true;
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needSetupViewport = true;
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fireLayoutChangeEvent();
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onScreenEnter();
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// enable events
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setListening(true);
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} else {
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onScreenLeave();
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active = false;
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// disable events
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setListening(false);
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}
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}
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/**
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* @return true if screen is the current screen
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*/
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public final boolean isActive()
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{
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return active;
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}
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@Override
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public void onLayoutChanged()
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{
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if (!isActive()) return;
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needSetupViewport = true;
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}
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@Override
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public final Rect getRect()
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{
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return App.gfx().getRect();
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}
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@Override
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public void render()
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{
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if (!isActive()) return;
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if (needSetupViewport) {
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App.gfx().setupProjection();
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}
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App.gfx().pushState();
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renderScreen();
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App.gfx().popState();
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}
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/**
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* Called when the screen becomes active
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*/
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@Stub
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protected void onScreenEnter()
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{
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}
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/**
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* Called when the screen is no longer active
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*/
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@Stub
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protected void onScreenLeave()
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{
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}
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/**
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* Render screen contents (context is ready for 2D rendering)
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*/
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protected abstract void renderScreen();
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}
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