New helper class adding a "clear" (×) button at the end of an EditText

diff --git a/app/src/main/java/net/ktnx/mobileledger/ui/EditTextWithClear.java b/app/src/main/java/net/ktnx/mobileledger/ui/EditTextWithClear.java
new file mode 100644 (file)
index 0000000..56d132f
--- /dev/null
+++ b/app/src/main/java/net/ktnx/mobileledger/ui/EditTextWithClear.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright © 2020 Damyan Ivanov.
+ * This file is part of MoLe.
+ * MoLe is free software: you can distribute it and/or modify it
+ * under the term of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your opinion), any later version.
+ *
+ * MoLe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License terms for details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package net.ktnx.mobileledger.ui;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.text.Editable;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+
+import net.ktnx.mobileledger.R;
+
+public final class EditTextWithClear extends androidx.appcompat.widget.AppCompatEditText {
+    private boolean hadText = false;
+
+    public EditTextWithClear(Context context) {
+        super(context);
+    }
+    public EditTextWithClear(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+    public EditTextWithClear(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        if (focused) {
+            final Editable text = getText();
+            if ((text != null) && (text.length() > 0)) {
+                showClearDrawable();
+            }
+        }
+        else {
+            hideClearDrawable();
+        }
+
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+    }
+    private void hideClearDrawable() {
+        setCompoundDrawablesRelative(null, null, null, null);
+    }
+    private void showClearDrawable() {
+        setCompoundDrawablesRelativeWithIntrinsicBounds(0, 0, R.drawable.ic_clear_black_24dp, 0);
+    }
+    @Override
+    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
+        final boolean hasText = text.length() > 0;
+
+        if (hasFocus()) {
+            if (hadText && !hasText)
+                hideClearDrawable();
+            if (!hadText && hasText)
+                showClearDrawable();
+        }
+
+        hadText = hasText;
+
+        super.onTextChanged(text, start, lengthBefore, lengthAfter);
+    }
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (event.getAction() == MotionEvent.ACTION_UP) {
+            final Editable text = getText();
+            if ((text != null) && (text.length() > 0)) {
+                boolean clearClicked = false;
+                final float x = event.getX();
+                final int vw = getWidth();
+                // start, top, end, bottom (end == 2)
+                Drawable dwb = getCompoundDrawablesRelative()[2];
+                if (dwb != null) {
+                    final int dw = dwb.getBounds()
+                                      .width();
+                    if (getLayoutDirection() == View.LAYOUT_DIRECTION_LTR) {
+                        if ((x > vw - dw))
+                            clearClicked = true;
+                    }
+                    else {
+                        if (x < vw - dw)
+                            clearClicked = true;
+                    }
+                    if (clearClicked) {
+                        setText("");
+                        requestFocus();
+                        performClick();
+                        return true;
+                    }
+                }
+            }
+        }
+
+        return super.onTouchEvent(event);
+    }
+    @Override
+    public boolean performClick() {
+        return super.performClick();
+    }
+}