104 lines
3.4 KiB
Java
104 lines
3.4 KiB
Java
/*
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* Minecraft Forge
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* Copyright (c) 2016-2019.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package net.minecraftforge.fml.client.gui;
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import net.minecraft.client.gui.widget.Widget;
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/**
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* This class implements an easy way to check if the mouse has hovered within a certain region of the screen for a given
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* period of time. The region can be defined manually or by supplying a GuiButton object.
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*
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* @author bspkrs
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*/
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public class HoverChecker
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{
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private int top, bottom, left, right, threshold;
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private Widget widget;
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private long hoverStart;
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public HoverChecker(int top, int bottom, int left, int right, int threshold)
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{
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this.top = top;
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this.bottom = bottom;
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this.left = left;
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this.right = right;
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this.threshold = threshold;
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this.hoverStart = -1;
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}
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public HoverChecker(Widget widget, int threshold)
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{
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this.widget = widget;
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this.threshold = threshold;
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}
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/**
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* Call this method if the intended region has changed such as if the region must follow a scrolling list.
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* It is not necessary to call this method if a GuiButton defines the hover region.
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*/
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public void updateBounds(int top, int bottom, int left, int right)
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{
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this.top = top;
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this.bottom = bottom;
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this.left = left;
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this.right = right;
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}
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/**
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* Checks if the mouse is in the hover region. If the specified time period has elapsed the method returns true.
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* The hover timer is reset if the mouse is not within the region.
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*/
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public boolean checkHover(int mouseX, int mouseY)
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{
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return checkHover(mouseX, mouseY, true);
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}
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/**
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* Checks if the mouse is in the hover region. If the specified time period has elapsed the method returns true.
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* The hover timer is reset if the mouse is not within the region.
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*/
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public boolean checkHover(int mouseX, int mouseY, boolean canHover)
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{
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if (this.widget != null)
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{
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this.top = widget.y;
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this.bottom = widget.y + widget.getHeight();
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this.left = widget.x;
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this.right = widget.x + widget.getWidth();
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canHover = canHover && widget.visible;
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}
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if (canHover && hoverStart == -1 && mouseY >= top && mouseY <= bottom && mouseX >= left && mouseX <= right)
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hoverStart = System.currentTimeMillis();
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else if (!canHover || mouseY < top || mouseY > bottom || mouseX < left || mouseX > right)
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resetHoverTimer();
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return canHover && hoverStart != -1 && System.currentTimeMillis() - hoverStart >= threshold;
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}
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/**
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* Manually resets the hover timer.
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*/
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public void resetHoverTimer()
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{
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hoverStart = -1;
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}
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}
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