textfield.java

j2me设计的界面包

     * @param keyCode the keycode to check
     * @return true if this is the star symbol *
     */
    protected boolean isSymbolDialogKey(int keyCode) {
        return keyCode == '*';
    }
    
    /**
     * @inheritDoc
     */
    public void keyPressed(int keyCode) {
        pressedAndNotReleased = true;
        pressedKeyCode = keyCode;
        pressTime = System.currentTimeMillis();
        if((!handlesInput()) && isEditingTrigger(keyCode)) {
            setHandlesInput(true);
            if(useSoftkeys) {
                T9_COMMAND.setDisposesDialog(false);
                DELETE_COMMAND.setDisposesDialog(false);
                originalClearCommand = installCommands(DELETE_COMMAND, T9_COMMAND);
            }
            return;
        }
        if(handlesInput() && isEditingEndTrigger(keyCode)) {
            setHandlesInput(false);
            if(useSoftkeys) {
                removeCommands(DELETE_COMMAND, T9_COMMAND, originalClearCommand);
            }
            fireActionEvent();
            return;
        } else {
            if(handlesInput()) {
                return;
            }
        }
        super.keyPressed(keyCode);
    }
    
    /**
     * Installs the clear and t9 commands onto the parent form, this method can
     * be overriden to provide device specific placement for these commands
     * 
     * @param clear the clear command
     * @param t9 the t9 command
     * @return clear command already installed in the form if applicable, none if no
     * clear command was installed before or not applicable.
     */
    protected Command installCommands(Command clear, Command t9) {
        Form f = getComponentForm();
        Command original = f.getClearCommand();
        if(replaceMenu && originalCommands == null) {
            originalCommands = new Command[f.getCommandCount()];
            for(int iter = 0 ; iter < originalCommands.length ; iter++) {
                originalCommands[iter] = f.getCommand(iter);
            }
            f.removeAllCommands();
        }
        
        f.addCommand(clear, 0);
        f.addCommand(t9, 0);
        f.setClearCommand(clear);
        return original;
    }
    
    /**
     * Removes the clear and t9 commands from the parent form, this method can
     * be overriden to provide device specific placement for these commands
     * 
     * @param clear the clear command
     * @param t9 the t9 command
     * @param originalClear the command originally assigned as the clear command (or null if no command was assigned before)
     */
    protected void removeCommands(Command clear, Command t9, Command originalClear) {
        Form f = getComponentForm();
        f.removeCommand(clear);
        f.removeCommand(t9);
        f.setClearCommand(originalClear);
        if(replaceMenu && originalCommands != null) {
            for(int iter = originalCommands.length - 1 ; iter >= 0 ; iter--) {
                f.addCommand(originalCommands[iter]);
            }
            originalCommands = null;
        }
    }
    
    void focusLostInternal() {
        if(useSoftkeys) {
            Form f = getComponentForm();
            if(f != null) {
                removeCommands(DELETE_COMMAND, T9_COMMAND, originalClearCommand);
            }
        }
    }

    /**
     * Indicates whether the given key code should be ignored or should trigger
     * editing, by default fire or any numeric key should trigger editing implicitly.
     * This method is only called when handles input is false.
     * 
     * @param keyCode the keycode passed to the keyPressed method
     * @return true if this key code should cause a switch to editing mode.
     */
    protected boolean isEditingTrigger(int keyCode) {
        if(isQwertyInput()) {
            return keyCode > 0 || (Display.getInstance().getGameAction(keyCode) == Display.GAME_FIRE);
        }
        return (keyCode >= '0' && keyCode <= '9') || 
            (Display.getInstance().getGameAction(keyCode) == Display.GAME_FIRE);
    }
    
    /**
     * Indicates whether the given key code should be ignored or should trigger
     * cause editing to end. By default the fire key, up or down will trigger
     * the end of editing.
     * 
     * @param keyCode the keycode passed to the keyPressed method
     * @return true if this key code should cause a switch to editing mode.
     */
    protected boolean isEditingEndTrigger(int keyCode) {
        int k =Display.getInstance().getGameAction(keyCode);
        if(isQwertyInput()) {
            return keyCode < 0 && (k == Display.GAME_FIRE || k == Display.GAME_UP || k == Display.GAME_DOWN);
        }
        return (k == Display.GAME_FIRE || k == Display.GAME_UP || k == Display.GAME_DOWN);
    }
    
    /**
     * @inheritDoc
     */
    public void paint(Graphics g) {
        UIManager.getInstance().getLookAndFeel().drawTextField(g, this);
        if (drawCursor) {
            UIManager.getInstance().getLookAndFeel().drawTextFieldCursor(g, this);
        }
    }

    /**
     * @inheritDoc
     */
    protected Dimension calcPreferredSize() {
        return UIManager.getInstance().getLookAndFeel().getTextFieldPreferredSize(this);
    }
    
    /**
     * @inheritDoc
     */
    protected void initComponent() {
        getComponentForm().registerAnimated(this);
    }
    
    /**
     * The amount of time in milliseconds in which the cursor is visible
     */
    public void setCursorBlinkTimeOn(int time) {
        blinkOnTime = time;
    }

    /**
     * The amount of time in milliseconds in which the cursor is invisible
     */
    public void setCursorBlinkTimeOff(int time) {
        blinkOffTime = time;
    }
    
    /**
     * The amount of time in milliseconds in which the cursor is visible
     */
    public int getCursorBlinkTimeOn() {
        return blinkOnTime;
    }

    /**
     * The amount of time in milliseconds in which the cursor is invisible
     */
    public int getCursorBlinkTimeOff() {
        return blinkOffTime;
    }

    /**
     * @inheritDoc
     */
    public boolean animate() {
        boolean ani = super.animate();
        if(hasFocus()) {
            long currentTime = System.currentTimeMillis();
            if (drawCursor) {
                if ((currentTime - cursorBlinkTime) > blinkOnTime) {
                    cursorBlinkTime = currentTime;
                    drawCursor = false;
                    return true;
                }
            } else {
                if ((currentTime - cursorBlinkTime) > blinkOffTime) {
                    cursorBlinkTime = currentTime;
                    drawCursor = true;
                    return true;
                }
            }
            if(pressedAndNotReleased) { 
                if(currentTime - pressTime >= getLongClickDuration()) {
                    longClick(pressedKeyCode);
                }
            } else {
                if(pendingCommit && currentTime - releaseTime > commitTimeout) {
                    commitChange();
                }
            }
        } else {
            drawCursor = false;
        }
        return ani;
    }
    
    /**
     * @inheritDoc
     */
    public void pointerReleased(int x, int y) {
        // unlike text area the text field supports shifting the cursor with the touch screen
        String text = getText();
        int textLength = text.length();
        int position = 0;
        Font f = getStyle().getFont();
        x -= getAbsoluteX();
        for(int iter = 0 ; iter < textLength ; iter++) {
            int width = f.substringWidth(text, 0, iter);
            if(x > width) {
                position = iter;
            } else {
                break;
            }
        }
        if(position == textLength - 1) {
            if(f.stringWidth(text) < x) {
                position = textLength;
            }
        }
        setCursorPosition(position);
        repaint();
    }

    /**
     * When set to true softkeys are used to enable delete functionality
     */
    public boolean isUseSoftkeys() {
        return useSoftkeys;
    }

    /**
     * When set to true softkeys are used to enable delete functionality
     */
    public void setUseSoftkeys(boolean useSoftkeys) {
        this.useSoftkeys = useSoftkeys;
    }
    
    /**
     * Adds a listener for data change events it will be invoked for every change
     * made to the text field
     */
    public void addDataChangeListener(DataChangedListener d) {
        if(listeners == null) {
            listeners = new Vector();
        }
        if(!listeners.contains(d)) {
            listeners.addElement(d);
        }
    }

    /**
     * Removes the listener for data change events 
     */
    public void removeDataChangeListener(DataChangedListener d) {
        if(listeners == null) {
            listeners = new Vector();
        }
        listeners.removeElement(d);
    }
    
    private void fireDataChanged(int type, int index) {
        if(listeners != null) {
            for(int iter = 0 ; iter < listeners.size() ; iter++) {
                DataChangedListener d = (DataChangedListener)listeners.elementAt(iter);
                d.dataChanged(type, index);
            }
        }
    }
    
    /**
     * @inheritDoc
     */
    void onEditComplete(String text) {
        super.onEditComplete(text);
        setCursorPosition(text.length());
    }

    /**
     * Indicates whether the menu of the form should be replaced with the T9/Clear
     * commands for the duration of interactivity with the text field
     */
    public boolean isReplaceMenu() {
        return replaceMenu;
    }

    /**
     * Indicates whether the menu of the form should be replaced with the T9/Clear
     * commands for the duration of interactivity with the text field
     */
    public void setReplaceMenu(boolean replaceMenu) {
        this.replaceMenu = replaceMenu;
    }


    /**
     * Indicates whether the menu of the form should be replaced with the T9/Clear
     * commands for the duration of interactivity with the text field
     */
    public static boolean isReplaceMenuDefault() {
        return replaceMenuDefault;
    }

    /**
     * Indicates whether the menu of the form should be replaced with the T9/Clear
     * commands for the duration of interactivity with the text field
     */
    public static void setReplaceMenuDefault(boolean replaceMenu) {
        replaceMenuDefault = replaceMenu;
    }
}