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Code Issues Projects Releases Packages Wiki Activity Actions 2

Android: Implement InputConnection

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So that we can use text prediction and other input method features
This commit is contained in:
Olivier Goffart 2024-01-17 12:36:48 +01:00
parent daa40f43cd
commit 168654fa29
3 changed files with 349 additions and 58 deletions
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170
internal/backends/android-activity/java/SlintAndroidJavaHelper.java
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@ -2,23 +2,175 @@
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.1 OR LicenseRef-Slint-commercial
import android.view.View;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.content.Context;
import android.view.inputmethod.InputMethodManager;
import android.app.Activity;
import android.widget.FrameLayout;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.ExtractedText;
public class SlintAndroidJavaHelper {
class SlintInputView extends View {
private String mText = "";
private int mCursorPosition = 0;
private int mAnchorPosition = 0;
private String mPreedit = "";
private int mPreeditOffset;
public SlintInputView(Context context) {
super(context);
setFocusable(true);
setFocusableInTouchMode(true);
}
@Override
public boolean onCheckIsTextEditor() {
return true;
}
@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
outAttrs.inputType = EditorInfo.TYPE_CLASS_TEXT;
outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_EXTRACT_UI;
outAttrs.initialSelStart = mCursorPosition;
outAttrs.initialSelEnd = mAnchorPosition;
return new BaseInputConnection(this, false) {
@Override
public CharSequence getTextBeforeCursor(int n, int flags) {
return mText.substring(0, mCursorPosition);
}
@Override
public CharSequence getTextAfterCursor(int n, int flags) {
return mText.substring(mCursorPosition);
}
@Override
public CharSequence getSelectedText(int flags) {
if (mCursorPosition != mAnchorPosition) {
return mText.substring(mCursorPosition, mAnchorPosition);
}
return null;
}
@Override
public boolean commitText(CharSequence text, int newCursorPosition) {
mText = new StringBuilder(mText).delete(mCursorPosition, mAnchorPosition).insert(mCursorPosition, text)
.toString();
mPreedit = "";
if (newCursorPosition > 0) {
mCursorPosition = mCursorPosition + text.length() + newCursorPosition - 1;
} else {
mCursorPosition = mCursorPosition + newCursorPosition;
}
mAnchorPosition = mCursorPosition;
SlintAndroidJavaHelper.updateText(mText, mCursorPosition, mAnchorPosition, mPreedit, mPreeditOffset);
// return super.commitText(text, newCursorPosition);
return true;
}
@Override
public boolean deleteSurroundingText(int beforeLength, int afterLength) {
mText = new StringBuilder(mText).delete(mCursorPosition - beforeLength, mAnchorPosition + afterLength)
.toString();
mCursorPosition = mCursorPosition - beforeLength;
mAnchorPosition = mCursorPosition;
SlintAndroidJavaHelper.updateText(mText, mCursorPosition, mAnchorPosition, mPreedit, mPreeditOffset);
return true;
}
@Override
public boolean setComposingText(CharSequence text, int newCursorPosition) {
mPreedit = text.toString();
mPreeditOffset = newCursorPosition;
SlintAndroidJavaHelper.updateText(mText, mCursorPosition, mAnchorPosition, mPreedit, mPreeditOffset);
return super.setComposingText(text, newCursorPosition);
}
@Override
public boolean setSelection(int start, int end) {
mCursorPosition = start;
mAnchorPosition = end;
SlintAndroidJavaHelper.updateText(mText, mCursorPosition, mAnchorPosition, mPreedit, mPreeditOffset);
return true;
}
};
}
public void setText(String text, int cursorPosition, int anchorPosition, String preedit, int preeditOffset) {
mText = text;
mCursorPosition = cursorPosition;
mAnchorPosition = anchorPosition;
mPreedit = preedit;
mPreeditOffset = preeditOffset;
InputMethodManager imm = (InputMethodManager) this.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
ExtractedText extractedText = new ExtractedText();
extractedText.text = mText;
extractedText.startOffset = mPreeditOffset;
extractedText.selectionStart = mCursorPosition;
extractedText.selectionEnd = mAnchorPosition;
imm.updateExtractedText(this, 0, extractedText);
imm.updateSelection(this, cursorPosition, anchorPosition, cursorPosition, anchorPosition);
}
}
public class SlintAndroidJavaHelper {
Activity mActivity;
SlintInputView mInputView;
public SlintAndroidJavaHelper(Activity activity) {
this.mActivity = activity;
}
public void show_keyboard() {
InputMethodManager imm = (InputMethodManager)mActivity.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(mActivity.getWindow().getDecorView(), 0);
}
public void hide_keyboard() {
InputMethodManager imm = (InputMethodManager)mActivity.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mActivity.getWindow().getDecorView().getWindowToken(), 0);
this.mInputView = new SlintInputView(activity);
this.mActivity.runOnUiThread(new Runnable() {
@Override
public void run() {
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(10, 10);
mActivity.addContentView(mInputView, params);
mInputView.setVisibility(View.VISIBLE);
}
});
}
public void show_keyboard() {
mActivity.runOnUiThread(new Runnable() {
@Override
public void run() {
mInputView.requestFocus();
InputMethodManager imm = (InputMethodManager) mActivity.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(mInputView, 0);
}
});
}
public void hide_keyboard() {
mActivity.runOnUiThread(new Runnable() {
@Override
public void run() {
InputMethodManager imm = (InputMethodManager) mActivity.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mInputView.getWindowToken(), 0);
}
});
}
static public native void updateText(String text, int cursorPosition, int anchorPosition, String preedit,
int preeditOffset);
public void set_imm_data(String text, int cursor_position, int anchor_position, String preedit, int preedit_offset,
int rect_x, int rect_y, int rect_w, int rect_h, int input_type) {
mActivity.runOnUiThread(new Runnable() {
@Override
public void run() {
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(rect_w, rect_h);
layoutParams.setMargins(rect_x, rect_y, 0, 0);
mInputView.setLayoutParams(layoutParams);
int selStart = Math.min(cursor_position, anchor_position);
int selEnd = Math.max(cursor_position, anchor_position);
mInputView.setText(text, selStart, selEnd, preedit, preedit_offset);
}
});
}
}