Java tutorial
/** Copyright (C) <2015> <coolAlias> This file is part of coolAlias' Dynamic Sword Skills Minecraft Mod; as such, you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ package dynamicswordskills.client; import java.io.IOException; import java.util.ArrayList; import java.util.List; import net.minecraft.client.gui.inventory.GuiContainer; import net.minecraft.client.gui.inventory.GuiInventory; import net.minecraft.entity.player.EntityPlayer; import net.minecraft.inventory.Slot; import net.minecraft.util.EnumChatFormatting; import net.minecraft.util.ResourceLocation; import net.minecraft.util.StatCollector; import org.lwjgl.input.Mouse; import org.lwjgl.opengl.GL11; import dynamicswordskills.entity.DSSPlayerInfo; import dynamicswordskills.inventory.ContainerSkills; import dynamicswordskills.ref.Config; import dynamicswordskills.ref.ModInfo; import dynamicswordskills.skills.SkillBase; public class GuiSkills extends GuiContainer { private static final ResourceLocation texture = new ResourceLocation( ModInfo.ID + ":textures/gui/gui_skills.png"); /** Number of lines of text that can be drawn on the screen */ private static final int MAX_LINES = 11; /** Currently selected skill for displaying a description */ private SkillBase currentSkill = null; /** The description to display */ private final List<String> desc = new ArrayList<String>(50); /** Current y position at which to draw text; coordinates set as though gui was entire screen */ private int textY; /** Current position of the scroll bar, as a float (0 is top, 1 is bottom) */ private float scrollY; /** True if the scroll bar is being dragged */ private boolean isScrolling; /** Whether left mouse button is held down */ private boolean wasClicking; /** The number of lines in the current skill's description */ private int numLines; /** Flag for whether current font is in unicode, to prevent overriding the font */ private boolean isUnicode; /** Tracks current mouseX, used for rendering player model rotation. Defined as float, passed as int */ private float xSize_lo; /** Tracks current mouseY, used for rendering player model rotation. Defined as float, passed as int. */ private float ySize_lo; public GuiSkills(EntityPlayer player) { super(new ContainerSkills(player)); this.xSize = 281; this.ySize = 180; } @Override public void drawScreen(int mouseX, int mouseY, float f) { super.drawScreen(mouseX, mouseY, f); xSize_lo = mouseX; ySize_lo = mouseY; boolean flag = Mouse.isButtonDown(0); int x1 = guiLeft + 259; int y1 = guiTop + 61; if (!wasClicking && flag && isMouseInRegion(mouseX, mouseY, x1, x1 + 3, y1, y1 + 88)) { isScrolling = needsScrollBar(); } if (!flag) { isScrolling = false; } wasClicking = flag; if (isScrolling) { scrollY = ((float) (mouseY - y1) - 3.0F) / 81.0F; clampScrollBar(); } } /** Returns true if the mouse is within the real-screen coordinates specified */ private boolean isMouseInRegion(int mouseX, int mouseY, int x1, int x2, int y1, int y2) { return (mouseX >= x1 && mouseX < x2 && mouseY >= y1 && mouseY < y2); } @Override protected void drawGuiContainerForegroundLayer(int par1, int par2) { if (needsScrollBar()) { GL11.glPushAttrib(GL11.GL_ALL_ATTRIB_BITS); GL11.glEnable(GL11.GL_BLEND); mc.renderEngine.bindTexture(texture); RenderHelperQ.drawTexturedRect(259, 55, 282, 0, 3, 5, 285, 180); RenderHelperQ.drawTexturedRect(259, 150, 282, 5, 3, 5, 285, 180); RenderHelperQ.drawTexturedRect(260, 61, 283, 17, 1, 88, 285, 180); RenderHelperQ.drawTexturedRect(259, 61 + (int) (scrollY * 81), 282, 10, 3, 7, 285, 180); GL11.glPopAttrib(); } String s = (currentSkill != null ? currentSkill.getDisplayName().toUpperCase() : StatCollector.translateToLocal("skill.dss.gui.description")); isUnicode = fontRendererObj.getUnicodeFlag(); fontRendererObj.setUnicodeFlag(true); fontRendererObj.drawString(s, 158, 38, 4210752); if (currentSkill != null) { if (Config.isSkillEnabled(currentSkill.getId())) { s = currentSkill.getLevelDisplay(false); } else { s = (EnumChatFormatting.DARK_RED + StatCollector.translateToLocal("skill.dss.disabled")); } fontRendererObj.drawString(s, 262 - fontRendererObj.getStringWidth(s), 38, 4210752); } refreshDescription(); textY = 38 + (fontRendererObj.FONT_HEIGHT * 2); int start = (needsScrollBar() ? (int) (scrollY * (numLines - MAX_LINES)) : 0); for (int i = start; i < desc.size() && i < (MAX_LINES + start); ++i) { fontRendererObj.drawString(desc.get(i), 158, textY, 4210752); textY += fontRendererObj.FONT_HEIGHT; } fontRendererObj.setUnicodeFlag(isUnicode); } @Override protected void drawGuiContainerBackgroundLayer(float f, int i, int j) { RenderHelperQ.drawTexturedRect(texture, guiLeft, guiTop, 0, 0, xSize, ySize, 284, 180); GuiInventory.drawEntityOnScreen(guiLeft + 73, guiTop + 105, 30, guiLeft + 73 - xSize_lo, guiTop + 55 - ySize_lo, mc.thePlayer); } /** * Refreshes the description either when empty or the skill has changed */ private void refreshDescription() { if (!desc.isEmpty()) { return; } if (currentSkill != null) { desc.add(StatCollector.translateToLocal("skill.dss.gui.summary")); currentSkill.addInformation(desc, mc.thePlayer); desc.add(""); desc.add(StatCollector.translateToLocal("skill.dss.gui.activation")); desc.addAll(fontRendererObj.listFormattedStringToWidth(currentSkill.getActivationDisplay(), 101)); desc.add(""); } desc.add(StatCollector.translateToLocal("skill.dss.gui.description")); String[] temp = (currentSkill != null ? currentSkill.getFullDescription().split("\\\\n") : StatCollector.translateToLocal("skill.dss.gui.explanation").split("\\\\n")); for (String s : temp) { desc.addAll(fontRendererObj.listFormattedStringToWidth(s, 101)); desc.add(""); } numLines = desc.size(); } private boolean needsScrollBar() { return numLines > MAX_LINES; } /** * Clamps scroll bar position value between 0.0F and 1.0F */ private void clampScrollBar() { if (scrollY < 0.0F) { scrollY = 0.0F; } if (scrollY > 1.0F) { scrollY = 1.0F; } } @Override public void handleMouseInput() throws IOException { super.handleMouseInput(); if (needsScrollBar()) { int i = Mouse.getEventDWheel(); if (i != 0) { if (i < 0) { scrollY += 1.0F / (float) (numLines - MAX_LINES); } else { scrollY -= 1.0F / (float) (numLines - MAX_LINES); } } clampScrollBar(); } } @Override protected void mouseClickMove(int mouseX, int mouseY, int lastButtonClicked, long timeSinceMouseClick) { // do nothing } @Override protected void mouseReleased(int mouseX, int mouseY, int state) { // don't need to call super Slot slot = this.getSlotAtPosition(mouseX, mouseY); if (slot != null && slot.getStack() != null) { int id = (slot.getStack().getItemDamage() % SkillBase.getNumSkills()); if (currentSkill == null || currentSkill.getId() != id) { scrollY = 0.0F; // clear the current description so it refreshes next time the screen draws desc.clear(); } currentSkill = DSSPlayerInfo.get(mc.thePlayer).getPlayerSkill((byte) id); } } /** * Returns the slot at the given coordinates or null if there is none. (copied from GuiContainer) */ private Slot getSlotAtPosition(int x, int y) { for (int k = 0; k < inventorySlots.inventorySlots.size(); ++k) { Slot slot = (Slot) inventorySlots.inventorySlots.get(k); if (isPointInRegion(slot.xDisplayPosition, slot.yDisplayPosition, 16, 16, x, y)) { return slot; } } return null; } @Override protected void keyTyped(char c, int key) { if (key == 1 || key == mc.gameSettings.keyBindInventory.getKeyCode() || key == DSSKeyHandler.keys[DSSKeyHandler.KEY_SKILLS_GUI].getKeyCode()) { mc.thePlayer.closeScreen(); } } }