Examples of java.awt.im.InputMethodRequests

java.awt.im.InputMethodRequests
InputMethodRequests defines the requests that a text editing component has to handle in order to work with input methods. The component can implement this interface itself or use a separate object that implements it. The object implementing this interface must be returned from the component's getInputMethodRequests method.
The text editing component also has to provide an input method event listener.
The interface is designed to support one of two input user interfaces:
- on-the-spot input, where the composed text is displayed as part of the text component's text body.
- below-the-spot input, where the composed text is displayed in a separate composition window just below the insertion point where the text will be inserted when it is committed. Note that, if text is selected within the component's text body, this text will be replaced by the committed text upon commitment; therefore it is not considered part of the context that the text is input into.
@see java.awt.Component#getInputMethodRequests @see java.awt.event.InputMethodListener @author JavaSoft Asia/Pacific @since 1.2

                Rectangle2D maxCharBoundsRec = metrics.getMaxCharBounds(g);
                int newHeight = (int)maxCharBoundsRec.getHeight() + HEIGHT_MARGIN;
                int newFrameHeight = newHeight +compositionWindow.getInsets().top
                                               +compositionWindow.getInsets().bottom;
                // If it's a passive client, set the width always to PASSIVE_WIDTH (480px)
                InputMethodRequests req = handler.getClientInputMethodRequests();
                int newWidth = (req==null) ? PASSIVE_WIDTH : (int)bounds.getWidth() + WIDTH_MARGIN;
                int newFrameWidth = newWidth + compositionWindow.getInsets().left
                                             + compositionWindow.getInsets().right;
                setPreferredSize(new Dimension(newWidth, newHeight));
                compositionWindow.setSize(new Dimension(newFrameWidth, newFrameHeight));

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     * Positions the composition window near (usually below) the
     * insertion point in the client component if the client
     * component is an active client (below-the-spot input).
     */
    void updateWindowLocation() {
        InputMethodRequests req = handler.getClientInputMethodRequests();
        if (req == null) {
            // not an active client
            return;
        }


        Point windowLocation = new Point();


        Rectangle caretRect = req.getTextLocation(null);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension windowSize = compositionWindow.getSize();
        final int SPACING = 2;


        if (caretRect.x + windowSize.width > screenSize.width) {

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                compositionArea.setHandlerInfo(compositionAreaOwner, inputMethodContext);
            }
            // If the client component is an active client using below-the-spot style, then
            // make the composition window undecorated without a title bar.
            if(clientComponent!=null){
                InputMethodRequests req = clientComponent.getInputMethodRequests();
                if (req != null && inputMethodContext.useBelowTheSpotInput()) {
                    setCompositionAreaUndecorated(true);
                }
            }
        }

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                return compositionArea.getTextLocation(offset);
            } else if (composedText != null) {
                // there's composed text, but it's not displayed, so fake a rectangle
                return new Rectangle(0, 0, 0, 10);
            } else {
                InputMethodRequests requests = getClientInputMethodRequests();
                if (requests != null) {
                    return requests.getTextLocation(offset);
                } else {
                    // passive client, no composed text, so fake a rectangle
                    return new Rectangle(0, 0, 0, 10);
                }
            }

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            }
        }
    }


    public int getInsertPositionOffset() {
        InputMethodRequests req = getClientInputMethodRequests();
        if (req != null) {
            return req.getInsertPositionOffset();
        }


        // we don't have access to the client component's text.
        return 0;
    }

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            (new AttributedString("")).getIterator();


    public AttributedCharacterIterator getCommittedText(int beginIndex,
                                                       int endIndex,
                                                       Attribute[] attributes) {
        InputMethodRequests req = getClientInputMethodRequests();
        if(req != null) {
            return req.getCommittedText(beginIndex, endIndex, attributes);
        }


        // we don't have access to the client component's text.
        return EMPTY_TEXT;
    }

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        // we don't have access to the client component's text.
        return EMPTY_TEXT;
    }


    public int getCommittedTextLength() {
        InputMethodRequests req = getClientInputMethodRequests();
        if(req != null) {
            return req.getCommittedTextLength();
        }


        // we don't have access to the client component's text.
        return 0;
    }

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        return 0;
    }




    public AttributedCharacterIterator cancelLatestCommittedText(Attribute[] attributes) {
        InputMethodRequests req = getClientInputMethodRequests();
        if(req != null) {
            return req.cancelLatestCommittedText(attributes);
        }


        // we don't have access to the client component's text.
        return null;
    }

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        // we don't have access to the client component's text.
        return null;
    }


    public AttributedCharacterIterator getSelectedText(Attribute[] attributes) {
        InputMethodRequests req = getClientInputMethodRequests();
        if(req != null) {
            return req.getSelectedText(attributes);
        }


        // we don't have access to the client component's text.
        return EMPTY_TEXT;
    }

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                // If the client component is an active client with the below-the-spot
                // input style, then make the composition window undecorated without a title bar.
                InputMethodContext inputContext = ((InputMethodContext)this);
                if (!inputContext.isCompositionAreaVisible()) {
                      InputMethodRequests req = source.getInputMethodRequests();
                      if (req != null && inputContext.useBelowTheSpotInput()) {
                          inputContext.setCompositionAreaUndecorated(true);
                      } else {
                          inputContext.setCompositionAreaUndecorated(false);
                      }

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Related Classes of java.awt.im.InputMethodRequests

org.apache.harmony.awt.im.CompositionWindow$ActiveClient

org.apache.harmony.awt.im.InputMethodContext

sun.awt.im.InputContext

sun.awt.im.InputMethodContext

sun.awt.im.CompositionArea

sun.awt.im.CompositionAreaHandler

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