從列表中訪問超類的原始類

Question

我正在嘗試創建自己的GUI庫，並且在超級類中遇到了一些困難（這對我來說是新的，並且找不到一個很好的學習來源）。但是我的所有組件都是從「GGUI」擴展而來，然後將它們存儲在一個ArrayList中以便於訪問。我的問題是，我得到一個錯誤：「隱式超級構造函數GrimGUI.GGUI（）是未定義的，必須顯式調用另一個構造函數」。

GrimGUI：

Button testScreen; 
Slider firstSlider; 
Slider secondSlider; 
Text firstSliderText; 
Text secondSliderText; 

boolean onHome; 
boolean onTest; 

ArrayList<GGUI> gguiScreen = new ArrayList<GGUI>(); 
void setup() { 
    size(500, 500); 
    onHome = true; 
    background(255); 
    gguiScreen.add(new Button(75, 50, 40, 20)); 

    testScreen = new Button(115, 50, 40, 20); 
    testScreen.cNormal = color(0, 255, 125); 


    firstSlider = new Slider(250, 250, 100); 
    secondSlider = new Slider(250, 280, 100); 

    firstSliderText = new Text(280, 250, "0"); 
    secondSliderText = new Text(280, 280, "0"); 
} 

void draw() { 
    background(255); 
    HomeScreen(); 
    TestScreen(); 

    endFix(); 
} 

void HomeScreen() { 
    if (onHome) { 
    testScreen.Update(); 
    firstSlider.Update(); 
    firstSliderText.content = str(firstSlider.value); 
    firstSliderText.Update(); 
    if (testScreen.released) { 
     onTest = true; 
     onHome = false; 
    } 
    } 
} 

void TestScreen() { 
    if (onTest) { 
    Button trash = (Button)gguiScreen.get(0);//Testing that I can get the only object placed in it to view on screen 
    trash.Update(); 
    secondSlider.Update(); 
    secondSliderText.content = str(secondSlider.value); 
    secondSliderText.Update(); 
    if (trash.WasClicked()) { 
     onTest = false; 
     onHome = true; 
    } 
    } 
} 

按鈕：

class Button extends GGUI { 
    boolean visible, pressed, released, hovering; 
    color cNormal, cPressed, cReleased, cHovering; 
    float x, y, w, h; 

    Button(float X, float Y, float W, float H) { 
    visible = true; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = color(75, 75, 75); 
    cPressed = color(100, 100, 100); 
    cReleased = color(125, 125, 125); 
    cHovering = color(175, 175, 175); 
    } 
    Button(boolean visibility, float X, float Y, float W, float H) { 
    visible = visibility; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = color(75, 75, 75); 
    cPressed = color(100, 100, 100); 
    cReleased = color(125, 125, 125); 
    cHovering = color(175, 175, 175); 
    } 
    Button(boolean visibility, float X, float Y, float W, float H, color CNORMAL, color CPRESSED) { 
    visible = visibility; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = CNORMAL; 
    cPressed = CPRESSED; 
    cReleased = color(125, 125, 125); 
    cHovering = color(175, 175, 175); 
    } 
    Button(boolean visibility, float X, float Y, float W, float H, color CNORMAL, color CPRESSED, color CHOVERING) { 
    visible = visibility; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = CNORMAL; 
    cPressed = CPRESSED; 
    cHovering = CHOVERING; 
    cReleased = color(125, 125, 125); 
    } 
    Button(boolean visibility, float X, float Y, float W, float H, color CNORMAL, color CPRESSED, color CHOVERING, color CRELEASED) { 
    visible = visibility; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = CNORMAL; 
    cPressed = CPRESSED; 
    cHovering = CHOVERING; 
    cReleased = CRELEASED; 
    } 


    void Update() { 
    CheckState(); 
    if (visible) {//WILL NOT RENDER IF NOT VISIBLE 
     if (pressed && !released) {// IF PRESSED 
     fill(cPressed); 
     } 
     if (released && !pressed) {// IF RELEASED 
     fill(cReleased); 
     } 
     if (hovering && !released && !pressed) {// IF HOVERING 
     fill(cHovering); 
     } 
     if (!hovering && !released && !pressed) {// IF NORMAL/NOT ACTIVE 
     fill(cNormal); 
     } 
     stroke(1); 
     rect(x, y, w, h); 
    } 
    } 

    void CheckState() { 
    hovering = false; 
    released = false; 
    if (mouseX > x && mouseX < x + w) { 
     if (mouseY > y && mouseY < y + h) { 
     hovering = true; 
     } 
    } 
    if (hovering) { 
     if (mPressed) { 
     pressed = true; 
     released = false; 
     } 
     if (mClicked) { 
     released = true; 
     pressed = false; 
     } 
    } else { 
     pressed = false; 
     released = false; 
     hovering = false; 
    } 
    } 

    boolean WasClicked() { 
    return pressed; 
    } 
} 

GGUI：

class GGUI { 
    int x, y; 
    boolean visible; 
    color cBase, cSecondary; 

    GGUI(int _x, int _y, boolean _visible, color _cBase, color _cSecondary) { 
    x = _x; 
    y = _y; 
    visible = _visible; 
    cBase = _cBase; 
    cSecondary = _cSecondary; 
    } 

    void Update() { 
    println("Updated"); 
    } 
} 

Answer 1

Implicit super constructor GrimGUI.GGUI() is undefined

所以把它定義

class GGUI { 
    GGUI() { 
     // Set some default values 
    } 

must explicitly invoke another constructor

或者你需要調用super()構造

Button(<params...>) { 
    super(<params...>) 
    ... // set more things 
} 

但是，這沒有任何意義，因爲按鍵似乎已經float x,y而不是int x,y像GGUI類期望。

想想這樣 - 圖形用戶界面真的可以在像素的一小部分上放一個按鈕嗎？

---

注意，您可以顯著降低喜歡你的代碼，以便

Button(boolean visibility, float X, float Y, float W, float H, color CNORMAL, color CPRESSED, color CHOVERING, color CRELEASED) { 
    visible = visibility; 
    x = X; 
    y = Y; 
    w = W; 
    h = H; 
    cNormal = CNORMAL; 
    cPressed = CPRESSED; 
    cHovering = CHOVERING; 
    cReleased = CRELEASED; 
    } 

    // For example... 
    Button(boolean visibility, float X, float Y, float W, float H, color CNORMAL, color CPRESSED, color CHOVERING) { 
    // Call the other constructor 
    this(visibility, X, Y, W, H, CNORMAL, CPRESSED, CHOVERING, color(125, 125, 125)); 
    cReleased = color(125, 125, 125); 
    }