Re-implement GuiTextField without depending on the Minecraft Text Field

src/main/java/com/replaymod/online/gui/GuiLoginPrompt.java

@@ -8,6 +8,7 @@ import de.johni0702.minecraft.gui.element.GuiLabel;
 import de.johni0702.minecraft.gui.element.GuiPasswordField;
 import de.johni0702.minecraft.gui.element.GuiTextField;
 import de.johni0702.minecraft.gui.layout.CustomLayout;
+import de.johni0702.minecraft.gui.utils.Consumer;
 import eu.crushedpixel.replaymod.gui.GuiConstants;
 
 public class GuiLoginPrompt extends AbstractGuiScreen<GuiLoginPrompt> {
@@ -72,9 +73,9 @@ public class GuiLoginPrompt extends AbstractGuiScreen<GuiLoginPrompt> {
                 new GuiRegister(apiClient, GuiLoginPrompt.this).display();
             }
         });
-        Runnable contentValidation = new Runnable() {
+        Consumer<String> contentValidation = new Consumer<String>() {
             @Override
-            public void run() {
+            public void consume(String obj) {
                 loginButton.setEnabled(!username.getText().isEmpty() && !password.getText().isEmpty());
             }
         };

src/main/java/com/replaymod/online/gui/GuiRegister.java

@@ -9,6 +9,7 @@ import de.johni0702.minecraft.gui.element.*;
 import de.johni0702.minecraft.gui.layout.CustomLayout;
 import de.johni0702.minecraft.gui.layout.HorizontalLayout;
 import de.johni0702.minecraft.gui.layout.VerticalLayout;
+import de.johni0702.minecraft.gui.utils.Consumers;
 import eu.crushedpixel.replaymod.gui.GuiConstants;
 import eu.crushedpixel.replaymod.utils.EmailAddressUtils;
 import eu.crushedpixel.replaymod.utils.RegexUtils;
@@ -137,7 +138,7 @@ public class GuiRegister extends AbstractGuiScreen<GuiRegister> {
                 }
             }
         };
-        inputs.forEach(IGuiTextField.class).onTextChanged(contentValidation);
+        inputs.forEach(IGuiTextField.class).onTextChanged(Consumers.from(contentValidation));
 
         cancelButton.onClick(new Runnable() {
             @Override

src/main/java/com/replaymod/replay/gui/screen/GuiReplayViewer.java

@@ -165,9 +165,9 @@ public class GuiReplayViewer extends GuiScreen {
                         popup.getYesButton().onClick();
                     }
                 }
-            }).onTextChanged(new Runnable() {
+            }).onTextChanged(new Consumer<String>() {
                 @Override
-                public void run() {
+                public void consume(String obj) {
                     popup.getYesButton().setEnabled(!nameField.getText().isEmpty());
                 }
             });

src/main/java/de/johni0702/minecraft/gui/element/AbstractGuiTextField.java

@@ -22,6 +22,7 @@
 
 package de.johni0702.minecraft.gui.element;
 
+import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
 import de.johni0702.minecraft.gui.GuiRenderer;
 import de.johni0702.minecraft.gui.RenderInfo;
@@ -30,84 +31,401 @@ import de.johni0702.minecraft.gui.function.Clickable;
 import de.johni0702.minecraft.gui.function.Focusable;
 import de.johni0702.minecraft.gui.function.Tickable;
 import de.johni0702.minecraft.gui.function.Typeable;
+import de.johni0702.minecraft.gui.utils.Consumer;
 import lombok.Getter;
-import net.minecraft.client.Minecraft;
+import lombok.NonNull;
 import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.renderer.Tessellator;
+import net.minecraft.client.renderer.WorldRenderer;
 import net.minecraft.client.resources.I18n;
+import net.minecraft.util.ChatAllowedCharacters;
 import org.lwjgl.input.Keyboard;
-import org.lwjgl.util.Dimension;
-import org.lwjgl.util.ReadableColor;
-import org.lwjgl.util.ReadableDimension;
-import org.lwjgl.util.ReadablePoint;
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.util.*;
+
+import static net.minecraft.client.renderer.GlStateManager.*;
+import static net.minecraft.client.renderer.GlStateManager.disableColorLogic;
+import static net.minecraft.client.renderer.GlStateManager.enableTexture2D;
+import static net.minecraft.util.MathHelper.clamp_int;
 
 public abstract class AbstractGuiTextField<T extends AbstractGuiTextField<T>>
         extends AbstractGuiElement<T> implements Clickable, Tickable, Typeable, IGuiTextField<T> {
-    private final net.minecraft.client.gui.GuiTextField wrapped;
-
-    private Runnable textChanged;
-    private Runnable onEnter;
+    private static final ReadableColor BORDER_COLOR = new Color(160, 160, 160);
+    private static final ReadableColor CURSOR_COLOR = new Color(240, 240, 240);
+    private static final int BORDER = 4;
 
+    // Focus
+    @Getter
+    private boolean focused;
+    @Getter
     private Focusable next, previous;
 
+    // Content
+    @Getter
+    private int maxLength = 32;
+
+    @Getter
+    @NonNull
+    private String text = "";
+
+    private int cursorPos;
+    private int selectionPos;
+
     @Getter
     private String hint;
 
-    @Getter
-    private ReadableColor textColor;
+    // Rendering
+    private int currentOffset;
+    private int blinkCursorTick;
+    public ReadableColor textColorEnabled = new Color(224, 224, 224);
+    public ReadableColor textColorDisabled = new Color(112, 112, 112);
+    private ReadableDimension size = new Dimension(0, 0); // Size of last render
+
+    private Consumer<String> textChanged;
+    private Runnable onEnter;
 
     public AbstractGuiTextField() {
-        this.wrapped = new net.minecraft.client.gui.GuiTextField(0, Minecraft.getMinecraft().fontRendererObj, 0, 0, 0, 0);
     }
 
     public AbstractGuiTextField(GuiContainer container) {
         super(container);
-        this.wrapped = new net.minecraft.client.gui.GuiTextField(0, Minecraft.getMinecraft().fontRendererObj, 0, 0, 0, 0);
     }
 
     @Override
-    public void draw(GuiRenderer renderer, ReadableDimension size, RenderInfo renderInfo) {
-        ReadablePoint position = renderer.getOpenGlOffset();
-        wrapped.xPosition = position.getX() + 1;
-        wrapped.yPosition = position.getY() + 1;
-        wrapped.width = size.getWidth() - 2;
-        wrapped.height = size.getHeight() - 2;
-
-        if (wrapped.text.isEmpty() && !isFocused() && !Strings.isNullOrEmpty(hint)) {
-            wrapped.setEnabled(false);
-            wrapped.setDisabledTextColour(0xff404040);
-            wrapped.text = hint;
-            wrapped.drawTextBox();
-            wrapped.text = "";
-            wrapped.setDisabledTextColour(0xff707070);
-            wrapped.setEnabled(isEnabled());
+    public T setText(String text) {
+        if (text.length() > maxLength) {
+            this.text = text.substring(0, maxLength);
         } else {
-            wrapped.drawTextBox();
+            this.text = text;
+        }
+        selectionPos = cursorPos = text.length();
+        return getThis();
+    }
+
+    @Override
+    public T setI18nText(@NonNull String text, @NonNull Object... args) {
+        return setText(I18n.format(text, args));
+    }
+
+    @Override
+    public T setMaxLength(int maxLength) {
+        Preconditions.checkArgument(maxLength >= 0, "maxLength must not be negative");
+        this.maxLength = maxLength;
+        if (text.length() > maxLength) {
+            setText(text);
+        }
+        return getThis();
+    }
+
+    @Override
+    public String deleteText(int from, int to) {
+        Preconditions.checkArgument(from <= to, "from must not be greater than to");
+        Preconditions.checkArgument(from >= 0, "from must be greater than zero");
+        Preconditions.checkArgument(to < text.length(), "to must be less than test.length()");
+
+        String deleted = text.substring(from, to + 1);
+        text = text.substring(0, from) + text.substring(to + 1);
+        return deleted;
+    }
+
+    @Override
+    public int getSelectionFrom() {
+        return cursorPos > selectionPos ? selectionPos : cursorPos;
+    }
+
+    @Override
+    public int getSelectionTo() {
+        return cursorPos > selectionPos ? cursorPos : selectionPos;
+    }
+
+    @Override
+    public String getSelectedText() {
+        return text.substring(getSelectionFrom(), getSelectionTo());
+    }
+
+    @Override
+    public String deleteSelectedText() {
+        if (cursorPos == selectionPos) {
+            return ""; // Nothing selected
+        }
+        int from = getSelectionFrom();
+        String deleted = deleteText(from, getSelectionTo() - 1);
+        cursorPos = selectionPos = from;
+        updateCurrentOffset();
+        return deleted;
+    }
+
+    /**
+     * Update current text offset to make sure the cursor is always visible.
+     */
+    private void updateCurrentOffset() {
+        currentOffset = Math.min(currentOffset, cursorPos);
+        String line = text.substring(currentOffset, cursorPos);
+        FontRenderer fontRenderer = getMinecraft().fontRendererObj;
+        int currentWidth = fontRenderer.getStringWidth(line);
+        if (currentWidth > size.getWidth() - 2*BORDER) {
+            currentOffset = cursorPos - fontRenderer.trimStringToWidth(line, size.getWidth() - 2*BORDER, true).length();
         }
     }
 
     @Override
-    public ReadableDimension calcMinSize() {
-        FontRenderer fontRenderer = getMinecraft().fontRendererObj;
-        return new Dimension(0, fontRenderer.FONT_HEIGHT);
+    public T writeText(String append) {
+        for (char c : append.toCharArray()) {
+            writeChar(c);
+        }
+        return getThis();
+    }
+
+    @Override
+    public T writeChar(char c) {
+        if (!ChatAllowedCharacters.isAllowedCharacter(c)) {
+            return getThis();
+        }
+
+        deleteSelectedText();
+
+        if (text.length() >= maxLength) {
+            return getThis();
+        }
+
+        text = text.substring(0, cursorPos) + c + text.substring(cursorPos);
+        selectionPos = ++cursorPos;
+
+        updateCurrentOffset();
+        return getThis();
+    }
+
+    @Override
+    public T deleteNextChar() {
+        if (cursorPos < text.length()) {
+            text = text.substring(0, cursorPos) + text.substring(cursorPos + 1);
+        }
+        selectionPos = cursorPos;
+        return getThis();
+    }
+
+    /**
+     * Return the amount of characters to the next word (excluding).
+     * If this is the last word in the line, return the amount of characters remaining to till the end.
+     * Everything except the Space character is considered part of a word.
+     * @return Length in characters
+     */
+    protected int getNextWordLength() {
+        int length = 0;
+        boolean inWord = true;
+        for (int i = cursorPos; i < text.length(); i++) {
+            if (inWord) {
+                if (text.charAt(i) == ' ') {
+                    inWord = false;
+                }
+            } else {
+                if (text.charAt(i) != ' ') {
+                    return length;
+                }
+            }
+            length++;
+        }
+        return length;
+    }
+
+    @Override
+    public String deleteNextWord() {
+        int worldLength = getNextWordLength();
+        if (worldLength > 0) {
+            return deleteText(cursorPos, cursorPos + worldLength);
+        }
+        return "";
+    }
+
+    @Override
+    public T deletePreviousChar() {
+        if (cursorPos > 0) {
+            text = text.substring(0, cursorPos - 1) + text.substring(cursorPos);
+            selectionPos = --cursorPos;
+            updateCurrentOffset();
+        }
+        return getThis();
+    }
+
+    /**
+     * Return the amount of characters to the previous word (including).
+     * If this is the first word in the line, return the amount of characters till the start.
+     * Everything except the Space character is considered part of a word.
+     * @return Length in characters
+     */
+    protected int getPreviousWordLength() {
+        int length = 0;
+        boolean inWord = false;
+        for (int i = cursorPos - 1; i >= 0; i--) {
+            if (inWord) {
+                if (text.charAt(i) == ' ') {
+                    return length;
+                }
+            } else {
+                if (text.charAt(i) != ' ') {
+                    inWord = true;
+                }
+            }
+            length++;
+        }
+        return length;
+    }
+
+    @Override
+    public String deletePreviousWord() {
+        int worldLength = getPreviousWordLength();
+        String deleted = "";
+        if (worldLength > 0) {
+            deleted = deleteText(cursorPos - worldLength, cursorPos);
+            selectionPos = cursorPos -= worldLength;
+            updateCurrentOffset();
+        }
+        return deleted;
+    }
+
+    @Override
+    public T setCursorPosition(int pos) {
+        Preconditions.checkArgument(pos >= 0 && pos <= text.length());
+        selectionPos = cursorPos = pos;
+        updateCurrentOffset();
+        return getThis();
+    }
+
+    /**
+     * Inverts all colors on the screen.
+     * @param guiRenderer The GUI Renderer
+     * @param right Right border of the inverted rectangle
+     * @param bottom Bottom border of the inverted rectangle
+     * @param left Left border of the inverted rectangle
+     * @param top Top border of the inverted rectangle
+     */
+    private void invertColors(GuiRenderer guiRenderer, int right, int bottom, int left, int top) {
+        int x = guiRenderer.getOpenGlOffset().getX();
+        int y = guiRenderer.getOpenGlOffset().getY();
+        right+=x;
+        left+=x;
+        bottom+=y;
+        top+=y;
+
+        color(0, 0, 255, 255);
+        disableTexture2D();
+        enableColorLogic();
+        colorLogicOp(GL11.GL_OR_REVERSE);
+
+        Tessellator tessellator = Tessellator.getInstance();
+        WorldRenderer renderer = tessellator.getWorldRenderer();
+        renderer.startDrawingQuads();
+        renderer.addVertex(right, top, 0);
+        renderer.addVertex(left, top, 0);
+        renderer.addVertex(left, bottom, 0);
+        renderer.addVertex(right, bottom, 0);
+        tessellator.draw();
+
+        disableColorLogic();
+        enableTexture2D();
+    }
+
+    @Override
+    protected ReadableDimension calcMinSize() {
+        return new Dimension(0, 0);
     }
 
     @Override
     public boolean mouseClick(ReadablePoint position, int button) {
-        wrapped.mouseClicked(position.getX(), position.getY(), button);
-        return false;
+        if (getContainer() != null) {
+            getContainer().convertFor(this, (Point) (position = new Point(position)));
+        }
+        boolean hovering = isMouseHovering(position);
+
+        if (hovering && isFocused() && button == 0) {
+            int mouseX = position.getX() - BORDER;
+            FontRenderer fontRenderer = getMinecraft().fontRendererObj;
+            String text = this.text.substring(currentOffset);
+            int textX = fontRenderer.trimStringToWidth(text, mouseX).length() + currentOffset;
+            setCursorPosition(textX);
+        }
+
+        setFocused(hovering);
+        return hovering;
+    }
+
+    protected boolean isMouseHovering(ReadablePoint pos) {
+        return pos.getX() > 0 && pos.getY() > 0
+                && pos.getX() < size.getWidth() && pos.getY() < size.getHeight();
+    }
+
+    @Override
+    public T setFocused(boolean isFocused) {
+        if (isFocused && !this.focused) {
+            this.blinkCursorTick = 0; // Restart blinking to indicate successful focus
+        }
+        this.focused = isFocused;
+        return getThis();
+    }
+
+    @Override
+    public T setNext(Focusable next) {
+        this.next = next;
+        return getThis();
+    }
+
+    @Override
+    public T setPrevious(Focusable previous) {
+        this.previous = previous;
+        return getThis();
+    }
+
+    @Override
+    public void draw(GuiRenderer renderer, ReadableDimension size, RenderInfo renderInfo) {
+        this.size = size;
+        int width = size.getWidth(), height = size.getHeight();
+        FontRenderer fontRenderer = getMinecraft().fontRendererObj;
+        int posY = height / 2 - fontRenderer.FONT_HEIGHT / 2;
+
+        // Draw black rect once pixel smaller than gray rect
+        renderer.drawRect(0, 0, width, height, BORDER_COLOR);
+        renderer.drawRect(1, 1, width - 2, height - 2, ReadableColor.BLACK);
+
+        if (text.isEmpty() && !isFocused() && !Strings.isNullOrEmpty(hint)) {
+            // Draw hint
+            String text = fontRenderer.trimStringToWidth(hint, width - 2*BORDER);
+            renderer.drawString(BORDER, posY, textColorDisabled, text);
+        } else {
+            // Draw text
+            String renderText = text.substring(currentOffset);
+            renderText = fontRenderer.trimStringToWidth(renderText, width - 2*BORDER);
+            ReadableColor color = isEnabled() ? textColorEnabled : textColorDisabled;
+            int lineEnd = renderer.drawString(BORDER, height / 2 - fontRenderer.FONT_HEIGHT / 2, color, renderText);
+
+            // Draw selection
+            int from = getSelectionFrom();
+            int to = getSelectionTo();
+            String leftStr = text.substring(0, clamp_int(from - currentOffset, 0, text.length()));
+            String rightStr = text.substring(clamp_int(to - currentOffset, 0, text.length()));
+            int left = BORDER + fontRenderer.getStringWidth(leftStr);
+            int right = lineEnd - fontRenderer.getStringWidth(rightStr) - 1;
+            invertColors(renderer, right, height - 2, left, 2);
+
+            // Draw cursor
+            if (blinkCursorTick / 6 % 2 == 0 && focused) {
+                String beforeCursor = text.substring(0, cursorPos - currentOffset);
+                int posX = BORDER + fontRenderer.getStringWidth(beforeCursor);
+                if (cursorPos == text.length()) {
+                    renderer.drawString(posX, posY, CURSOR_COLOR, "_", true);
+                } else {
+                    renderer.drawRect(posX, posY - 1, 1, 1 + fontRenderer.FONT_HEIGHT, CURSOR_COLOR);
+                }
+            }
+        }
     }
 
     @Override
     public boolean typeKey(ReadablePoint mousePosition, int keyCode, char keyChar, boolean ctrlDown, boolean shiftDown) {
-        if (!isFocused()) {
+        if (!this.focused) {
             return false;
         }
 
-        if (keyCode == Keyboard.KEY_RETURN) {
-            onEnter();
-            return true;
-        }
-
         if (keyCode == Keyboard.KEY_TAB) {
             Focusable other = shiftDown ? previous : next;
             if (other != null) {
@@ -117,106 +435,131 @@ public abstract class AbstractGuiTextField<T extends AbstractGuiTextField<T>>
             return true;
         }
 
-        String before = wrapped.getText();
-        wrapped.textboxKeyTyped(keyChar, keyCode);
-        String after = wrapped.getText();
-        if (!before.equals(after)) {
-            if (textChanged != null) {
-                textChanged.run();
+        if (keyCode == Keyboard.KEY_RETURN) {
+            onEnter();
+            return true;
+        }
+
+        String textBefore = text;
+        try {
+            if (GuiScreen.isCtrlKeyDown()) {
+                switch (keyCode) {
+                    case Keyboard.KEY_A: // Select all
+                        cursorPos = 0;
+                        selectionPos = text.length();
+                        updateCurrentOffset();
+                        return true;
+                    case Keyboard.KEY_C: // Copy
+                        GuiScreen.setClipboardString(getSelectedText());
+                        return true;
+                    case Keyboard.KEY_V: // Paste
+                        if (isEnabled()) {
+                            writeText(GuiScreen.getClipboardString());
+                        }
+                        return true;
+                    case Keyboard.KEY_X: // Cut
+                        if (isEnabled()) {
+                            GuiScreen.setClipboardString(deleteSelectedText());
+                        }
+                        return true;
+                }
+            }
+
+            boolean words = GuiScreen.isCtrlKeyDown();
+            boolean select = GuiScreen.isShiftKeyDown();
+            switch (keyCode) {
+                case Keyboard.KEY_HOME:
+                    cursorPos = 0;
+                    break;
+                case Keyboard.KEY_END:
+                    cursorPos = text.length();
+                    break;
+                case Keyboard.KEY_LEFT:
+                    if (cursorPos != 0) {
+                        if (words) {
+                            cursorPos -= getPreviousWordLength();
+                        } else {
+                            cursorPos--;
+                        }
+                    }
+                    break;
+                case Keyboard.KEY_RIGHT:
+                    if (cursorPos != text.length()) {
+                        if (words) {
+                            cursorPos += getNextWordLength();
+                        } else {
+                            cursorPos++;
+                        }
+                    }
+                    break;
+                case Keyboard.KEY_BACK:
+                    if (isEnabled()) {
+                        if (getSelectedText().length() > 0) {
+                            deleteSelectedText();
+                        } else if (words) {
+                            deletePreviousWord();
+                        } else {
+                            deletePreviousChar();
+                        }
+                    }
+                    return true;
+                case Keyboard.KEY_DELETE:
+                    if (isEnabled()) {
+                        if (getSelectedText().length() > 0) {
+                            deleteSelectedText();
+                        } else if (words) {
+                            deleteNextWord();
+                        } else {
+                            deleteNextChar();
+                        }
+                    }
+                    return true;
+                default:
+                    if (isEnabled()) {
+                        if (keyChar == '\r') {
+                            keyChar = '\n';
+                        }
+                        writeChar(keyChar);
+                    }
+                    return true;
+            }
+
+            updateCurrentOffset();
+
+            if (!select) {
+                selectionPos = cursorPos;
+            }
+            return true;
+        } finally {
+            if (!textBefore.equals(text)) {
+                onTextChanged(textBefore);
             }
         }
-        return true;
-    }
-
-    @Override
-    public T setText(String text) {
-        if (text.length() > wrapped.getMaxStringLength()) {
-            wrapped.text = text.substring(0, wrapped.getMaxStringLength());
-        } else {
-            wrapped.text = text;
-        }
-        return getThis();
-    }
-
-    @Override
-    public T setI18nText(String text, Object... args) {
-        return setText(I18n.format(text, args));
-    }
-
-    @Override
-    public String getText() {
-        return wrapped.text;
-    }
-
-    @Override
-    public boolean isFocused() {
-        return wrapped.isFocused();
-    }
-
-    @Override
-    public T setFocused(boolean focused) {
-        wrapped.setFocused(focused);
-        return getThis();
-    }
-
-    @Override
-    public Focusable getNext() {
-        return next;
-    }
-
-    @Override
-    public T setNext(Focusable next) {
-        if (this.next == next) return getThis();
-        if (this.next != null) {
-            this.next.setPrevious(null);
-        }
-        this.next = next;
-        if (this.next != null) {
-            this.next.setPrevious(this);
-        }
-        return getThis();
-    }
-
-    @Override
-    public Focusable getPrevious() {
-        return previous;
-    }
-
-    @Override
-    public T setPrevious(Focusable previous) {
-        if (this.previous == previous) return getThis();
-        if (this.previous != null) {
-            this.previous.setNext(null);
-        }
-        this.previous = previous;
-        if (this.previous != null) {
-            this.previous.setNext(this);
-        }
-        return getThis();
-    }
-
-    @Override
-    public int getMaxLength() {
-        return wrapped.getMaxStringLength();
-    }
-
-    @Override
-    public T setMaxLength(int maxLength) {
-        wrapped.setMaxStringLength(maxLength);
-        return getThis();
     }
 
     @Override
     public void tick() {
-        wrapped.updateCursorCounter();
+        blinkCursorTick++;
     }
 
+    /**
+     * Called when the user presses the Enter/Return key while this text field is focused.
+     */
     protected void onEnter() {
         if (onEnter != null) {
             onEnter.run();
         }
     }
 
+    /**
+     * Called when the text has changed due to user input.
+     */
+    protected void onTextChanged(String from) {
+        if (textChanged != null) {
+            textChanged.consume(from);
+        }
+    }
+
     @Override
     public T onEnter(Runnable onEnter) {
         this.onEnter = onEnter;
@@ -224,7 +567,7 @@ public abstract class AbstractGuiTextField<T extends AbstractGuiTextField<T>>
     }
 
     @Override
-    public T onTextChanged(Runnable textChanged) {
+    public T onTextChanged(Consumer<String> textChanged) {
         this.textChanged = textChanged;
         return getThis();
     }
@@ -240,10 +583,20 @@ public abstract class AbstractGuiTextField<T extends AbstractGuiTextField<T>>
         return setHint(I18n.format(hint));
     }
 
+    @Override
+    public ReadableColor getTextColor() {
+        return textColorEnabled;
+    }
+
     @Override
     public T setTextColor(ReadableColor textColor) {
-        this.textColor = textColor;
-        wrapped.setTextColor(textColor.getAlpha() << 24 | textColor.getRed() << 16 | textColor.getGreen() << 8 | textColor.getBlue());
+        this.textColorEnabled = textColor;
+        return getThis();
+    }
+
+    @Override
+    public T setTextColorDisabled(ReadableColor textColorDisabled) {
+        this.textColorDisabled = textColorDisabled;
         return getThis();
     }
 }

src/main/java/de/johni0702/minecraft/gui/element/IGuiTextField.java

@@ -23,24 +23,144 @@
 package de.johni0702.minecraft.gui.element;
 
 import de.johni0702.minecraft.gui.function.Focusable;
+import de.johni0702.minecraft.gui.utils.Consumer;
+import lombok.NonNull;
 import org.lwjgl.util.ReadableColor;
 
 public interface IGuiTextField<T extends IGuiTextField<T>> extends GuiElement<T>, Focusable<T> {
-    T setText(String text);
-    T setI18nText(String text, Object... args);
-    String getText();
+    /**
+     * Set the text to the specified string.
+     * If the string is longer than {@link #getMaxLength()} it is truncated from the end.
+     * This method positions the cursor at the end of the text and removes any selections.
+     * @param text The new text
+     * @return {@code this} for chaining
+     */
+    @NonNull T setText(@NonNull String text);
 
+    /**
+     * Set the text to the specified string.
+     * If the string is longer than {@link #getMaxLength()} it is truncated from the end.
+     * This method positions the cursor at the end of the text and removes any selections.
+     * @param text The language key for the new text
+     * @param args The arguments used in translating the language key
+     * @return {@code this} for chaining
+     */
+    @NonNull T setI18nText(@NonNull String text, @NonNull Object... args);
+
+    /**
+     * Return the whole text in this text field.
+     * @return The text, may be empty
+     */
+    @NonNull String getText();
+
+    /**
+     * Return the maximum allowed length of the text in this text field.
+     * @return Maximum number of characters
+     */
     int getMaxLength();
+
+    /**
+     * Set the maximum allowed length of the text in this text field.
+     * If the current test is longer than the new limit, it is truncated from the end (the cursor and selection
+     * are reset in that process, see {@link #setText(String)}).
+     * @param maxLength Maximum number of characters
+     * @return {@code this} for chaining
+     * @throws IllegalArgumentException When {@code maxLength} is negative
+     */
     T setMaxLength(int maxLength);
 
+    /**
+     * Deletes the text between {@code from} and {@code to} (inclusive).
+     * @param from Index at which to start
+     * @param to Index to which to delete
+     * @return The deleted text
+     * @throws IllegalArgumentException If {@code from} is greater than {@code to} or either is out of bounds
+     */
+    @NonNull String deleteText(int from, int to);
+
+    /**
+     * Return the index at which the selection starts (inclusive)
+     * @return Index of first character
+     */
+    int getSelectionFrom();
+
+    /**
+     * Return the index at which the selection ends (exclusive)
+     * @return Index after the last character
+     */
+    int getSelectionTo();
+
+    /**
+     * Return the selected text.
+     * @return The selected text
+     */
+    @NonNull String getSelectedText();
+
+    /**
+     * Delete the selected text. Positions the cursor at the beginning of the selection and clears the selection.
+     * @return The deleted text
+     */
+    @NonNull String deleteSelectedText();
+
+    /**
+     * Appends the specified string to this text field character by character.
+     * Excess characters are ignored.
+     * @param append String to append
+     * @return {@code this} for chaining
+     * @see #writeChar(char)
+     */
+    @NonNull T writeText(@NonNull String append);
+
+    /**
+     * Appends the specified character to this text field replacing the current selection (if any).
+     * This does nothing if the maximum character limit is reached.
+     * @param c Character to append
+     * @return {@code this} for chaining
+     */
+    @NonNull T writeChar(char c);
+
+    /**
+     * Delete the nex character (if any).
+     * Clears the selection.
+     * @return {@code this} for chaining
+     */
+    T deleteNextChar();
+
+    /**
+     * Delete everything from the cursor (inclusive) to the beginning of the next word (exclusive).
+     * If there are no more words, delete everything until the end of the line.
+     * @return The deleted text
+     */
+    String deleteNextWord();
+
+    /**
+     * Delete the previous character (if any).
+     * @return {@code this} for chaining
+     */
+    @NonNull T deletePreviousChar();
+
+    /**
+     * Delete everything from cursor to the first character of the previous word (or the start of the line).
+     * @return The deleted text
+     */
+    @NonNull String deletePreviousWord();
+
+    /**
+     * Set the cursor position.
+     * @param pos Position of the cursor
+     * @return {@code this} for chaining
+     * @throws IllegalArgumentException If {@code pos} &lt 0 or pos &gt length
+     */
+    @NonNull T setCursorPosition(int pos);
+
     T onEnter(Runnable onEnter);
-    T onTextChanged(Runnable textChanged);
+    T onTextChanged(Consumer<String> textChanged);
 
     String getHint();
     T setHint(String hint);
-
     T setI18nHint(String hint, Object... args);
 
     ReadableColor getTextColor();
     T setTextColor(ReadableColor textColor);
+    T setTextColorDisabled(ReadableColor textColorDisabled);
 }

src/main/java/de/johni0702/minecraft/gui/utils/Consumers.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2015 johni0702
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package de.johni0702.minecraft.gui.utils;
+
+public class Consumers {
+    public static <U>  Consumer<U> from(final Runnable runnable) {
+        return new Consumer<U>() {
+            @Override
+            public void consume(U obj) {
+                runnable.run();
+            }
+        };
+    }
+}