/*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* 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 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.
*
* For more information, please refer to <http://unlicense.org/>
*/
package javafx.embed.swt;
import com.sun.javafx.collections.ObservableListWrapper;
import com.sun.javafx.embed.EmbeddedSceneInterface;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.CharacterIterator;
import java.util.ArrayList;
import java.util.List;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Point2D;
import javafx.scene.input.InputMethodHighlight;
import javafx.scene.input.InputMethodRequests;
import javafx.scene.input.InputMethodTextRun;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.internal.win32.COMPOSITIONFORM;
import org.eclipse.swt.internal.win32.OS;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.IME;
/**
* 修正版的{@link FXCanvas}，包含可實作於子類別的修正
* <ul>
* <li>修正IME輸入問題（<a href="https://javafx-jira.kenai.com/browse/RT-39268">JavaFX-JIRA RT-39268</a>）</li>
* </ul>
*
* @author AqD
*/
@SuppressWarnings("restriction")
public class FXCanvas2 extends FXCanvas
{
private static Field scenePeerField;
private static Method sendResizeEventToFXMethod;
static
{
try
{
scenePeerField = FXCanvas.class.getDeclaredField("scenePeer");
sendResizeEventToFXMethod = FXCanvas.class.getDeclaredMethod("sendResizeEventToFX");
}
catch (ReflectiveOperationException e)
{
throw new RuntimeException(e);
}
scenePeerField.setAccessible(true);
sendResizeEventToFXMethod.setAccessible(true);
}
private final IME ime;
private EmbeddedSceneInterface scenePeer;
@SuppressWarnings("deprecation")
public FXCanvas2(Composite parent, int style)
{
super(parent, style);
if (System.getProperty("os.name").toLowerCase().contains("win"))
{
this.ime = new IME(this, SWT.NONE);
this.ime.addListener(SWT.ImeComposition, new org.eclipse.swt.widgets.Listener()
{
@Override
public void handleEvent(org.eclipse.swt.widgets.Event event)
{
switch (event.detail)
{
case SWT.COMPOSITION_CHANGED:
FXCanvas2.this.sendInputMethodEventToFX();
break;
}
}
});
}
else
{
this.ime = null;
}
}
/**
* 取得JavaFX的控制介面
*
* @return 控制介面
*/
public EmbeddedSceneInterface getScenePeer()
{
if (this.scenePeer == null)
{
try
{
this.scenePeer = (EmbeddedSceneInterface) scenePeerField.get(this);
}
catch (IllegalAccessException e)
{
throw new RuntimeException(e);
}
}
return this.scenePeer;
}
/**
* 強迫JavaFX的{@link javafx.stage.Stage}及{@link javafx.scene.Scene}重新依照目前畫布更新尺寸
*/
public void sendResizeEventToFX()
{
try
{
FXCanvas2.sendResizeEventToFXMethod.invoke(this);
}
catch (ReflectiveOperationException e)
{
throw new RuntimeException(e);
}
}
private void sendInputMethodEventToFX()
{
String text = this.getTextForEvent(this.ime.getText());
EmbeddedSceneInterface scenePeer = this.getScenePeer();
if (scenePeer != null)
{
String committed = text.substring(0, this.ime.getCommitCount());
if (this.ime.getText().length() == this.ime.getCommitCount())
{
// Send empty text when committed, because the actual chars will then be immediately sent via keys.
scenePeer.inputMethodEvent(
javafx.scene.input.InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,
FXCollections.emptyObservableList(), "", this.ime.getCompositionOffset());
}
else
{
ObservableList<InputMethodTextRun> composed = this.inputMethodEventComposed(text, this.ime.getCommitCount());
scenePeer.inputMethodEvent(
javafx.scene.input.InputMethodEvent.INPUT_METHOD_TEXT_CHANGED,
composed, committed, this.ime.getCaretOffset());
this.updateImeCandicatePos();
}
}
}
@SuppressWarnings("deprecation")
private void updateImeCandicatePos()
{
EmbeddedSceneInterface emScene = (EmbeddedSceneInterface) this.getScene().impl_getPeer();
InputMethodRequests imeRequests = emScene.getInputMethodRequests();
Point2D absolutePos = imeRequests.getTextLocation(0);
COMPOSITIONFORM lpCompForm = new COMPOSITIONFORM();
lpCompForm.dwStyle = OS.CFS_CANDIDATEPOS;
Point relativePos = this.toControl((int) absolutePos.getX(), (int) absolutePos.getY());
lpCompForm.x = relativePos.x;
lpCompForm.y = relativePos.y;
long hIMC = OS.ImmGetContext(this.handle);
try
{
OS.ImmSetCompositionWindow(hIMC, lpCompForm);
}
finally
{
OS.ImmReleaseContext(this.handle, hIMC);
}
}
private String getTextForEvent(String text)
{
if (text == null)
{
return "";
}
StringBuilder builder = new StringBuilder();
for (int i = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c == CharacterIterator.DONE)
{
break;
}
builder.append(c);
}
return builder.toString();
}
private ObservableList<InputMethodTextRun> inputMethodEventComposed(String text, int commitCount)
{
List<InputMethodTextRun> composed = new ArrayList<>();
if (commitCount < text.length())
{
composed.add(new InputMethodTextRun(
text.substring(commitCount), InputMethodHighlight.UNSELECTED_RAW));
}
return new ObservableListWrapper<>(composed);
}
}