ui代码注释

NoteItemData.java

@@ -0,0 +1,156 @@
+// 定义一个文本视图变化监听器的接口，用于监听文本编辑框中的变化事件
+private OnTextViewChangeListener mOnTextViewChangeListener;
+
+// NoteEditText的构造函数，当从AttributeSet创建时调用
+public NoteEditText(Context context) {
+    super(context, null);
+    mIndex = 0;
+}
+
+// 设置当前文本编辑框的索引，用于标识编辑框的位置
+public void setIndex(int index) {
+    mIndex = index;
+}
+
+// 设置文本视图变化监听器
+public void setOnTextViewChangeListener(OnTextViewChangeListener listener) {
+    mOnTextViewChangeListener = listener;
+}
+
+// NoteEditText的构造函数，当从AttributeSet和 defStyle创建时调用
+public NoteEditText(Context context, AttributeSet attrs) {
+    super(context, attrs, android.R.attr.editTextStyle);
+}
+
+// NoteEditText的构造函数，当从AttributeSet、defStyle和 defStyle创建时调用
+public NoteEditText(Context context, AttributeSet attrs, int defStyle) {
+    super(context, attrs, defStyle);
+    // TODO Auto-generated constructor stub
+}
+
+// 处理触摸事件，用于实现自定义的文本选择行为
+@Override
+public boolean onTouchEvent(MotionEvent event) {
+    switch (event.getAction()) {
+        case MotionEvent.ACTION_DOWN:
+            // 计算触摸点在文本中的位置，并设置光标
+            int x = (int) event.getX();
+            int y = (int) event.getY();
+            x -= getTotalPaddingLeft();
+            y -= getTotalPaddingTop();
+            x += getScrollX();
+            y += getScrollY();
+
+            Layout layout = getLayout();
+            int line = layout.getLineForVertical(y);
+            int off = layout.getOffsetForHorizontal(line, x);
+            Selection.setSelection(getText(), off);
+            break;
+    }
+
+    return super.onTouchEvent(event);
+}
+
+// 处理按键事件，例如Enter和Delete键
+@Override
+public boolean onKeyDown(int keyCode, KeyEvent event) {
+    switch (keyCode) {
+        case KeyEvent.KEYCODE_ENTER:
+            // 如果设置了监听器，消费Enter键事件
+            if (mOnTextViewChangeListener != null) {
+                return false;
+            }
+            break;
+        case KeyEvent.KEYCODE_DEL:
+            // 在删除之前记录光标的位置
+            mSelectionStartBeforeDelete = getSelectionStart();
+            break;
+        default:
+            break;
+    }
+    return super.onKeyDown(keyCode, event);
+}
+
+// 处理按键释放事件，例如Enter和Delete键
+@Override
+public boolean onKeyUp(int keyCode, KeyEvent event) {
+    switch(keyCode) {
+        case KeyEvent.KEYCODE_DEL:
+            // 如果设置了监听器，并且在删除之前光标位于文本开头，则通知监听器删除事件
+            if (mOnTextViewChangeListener != null) {
+                if (0 == mSelectionStartBeforeDelete && mIndex != 0) {
+                    mOnTextViewChangeListener.onEditTextDelete(mIndex, getText().toString());
+                    return true;
+                }
+            } else {
+                Log.d(TAG, "OnTextViewChangeListener was not seted");
+            }
+            break;
+        case KeyEvent.KEYCODE_ENTER:
+            // 如果设置了监听器，通知监听器Enter键事件，创建新的文本行
+            if (mOnTextViewChangeListener != null) {
+                int selectionStart = getSelectionStart();
+                String text = getText().subSequence(selectionStart, length()).toString();
+                setText(getText().subSequence(0, selectionStart));
+                mOnTextViewChangeListener.onEditTextEnter(mIndex + 1, text);
+            } else {
+                Log.d(TAG, "OnTextViewChangeListener was not seted");
+            }
+            break;
+        default:
+            break;
+    }
+    return super.onKeyUp(keyCode, event);
+}
+
+// 处理焦点变化事件，用于在文本编辑框失去焦点时通知监听器
+@Override
+protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+    if (mOnTextViewChangeListener != null) {
+        // 如果文本编辑框失去焦点且文本为空，通知监听器文本变化
+        if (!focused && TextUtils.isEmpty(getText())) {
+            mOnTextViewChangeListener.onTextChange(mIndex, false);
+        } else {
+            mOnTextViewChangeListener.onTextChange(mIndex, true);
+        }
+    }
+    super.onFocusChanged(focused, direction, previouslyFocusedRect);
+}
+
+// 创建上下文菜单，用于实现长按文本时弹出的菜单
+@Override
+protected void onCreateContextMenu(ContextMenu menu) {
+    if (getText() instanceof Spanned) {
+        int selStart = getSelectionStart();
+        int selEnd = getSelectionEnd();
+
+        int min = Math.min(selStart, selEnd);
+        int max = Math.max(selStart, selEnd);
+
+        // 如果选中的文本包含URL，添加一个菜单项用于打开链接
+        final URLSpan[] urls = ((Spanned) getText()).getSpans(min, max, URLSpan.class);
+        if (urls.length == 1) {
+            int defaultResId = 0;
+            for(String schema: sSchemaActionResMap.keySet()) {
+                if(urls[0].getURL().indexOf(schema) >= 0) {
+                    defaultResId = sSchemaActionResMap.get(schema);
+                    break;
+                }
+            }
+
+            if (defaultResId == 0) {
+                defaultResId = R.string.note_link_other;
+            }
+
+            menu.add(0, 0, 0, defaultResId).setOnMenuItemClickListener(
+                    new OnMenuItemClickListener() {
+                        public boolean onMenuItemClick(MenuItem item) {
+                            // 打开链接
+                            urls[0].onClick(NoteEditText.this);
+                            return true;
+                        }
+                    });
+        }
+    }
+    super.onCreateContextMenu(menu);
+}