[app] Add Expandable TextView (#1279)

* [app] Add Expandable TextView

app/src/main/java/org/lsposed/manager/ui/fragment/ModulesFragment.java

@@ -488,7 +488,8 @@ public class ModulesFragment extends BaseFragment implements ModuleUtil.ModuleLi
                     sb.setSpan(foregroundColorSpan, sb.length() - recommended.length(), sb.length(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
                 }
             }
-            holder.hint.setText(sb);
+            if (sb.length() == 0) holder.hint.setVisibility(View.GONE);
+            else holder.hint.setText(sb);
 
             if (!isPick) {
                 holder.root.setAlpha(moduleUtil.isModuleEnabled(item.packageName) ? 1.0f : .5f);

app/src/main/java/org/lsposed/manager/ui/widget/ExpandableTextView.java

@@ -0,0 +1,129 @@
+/*
+ * <!--This file is part of LSPosed.
+ *
+ * LSPosed is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LSPosed 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LSPosed.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2021 LSPosed Contributors-->
+ */
+
+package org.lsposed.manager.ui.widget;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.text.Layout;
+import android.text.SpannableString;
+import android.text.SpannableStringBuilder;
+import android.text.Spanned;
+import android.text.method.LinkMovementMethod;
+import android.text.style.ClickableSpan;
+import android.transition.TransitionManager;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+
+import org.lsposed.manager.R;
+
+public class ExpandableTextView extends TextView {
+    private CharSequence text = null;
+    private int nextLines = 0;
+    private final int maxLines;
+    private final SpannableString collapse;
+    private final SpannableString expand;
+    private final SpannableStringBuilder sb = new SpannableStringBuilder();
+
+    public ExpandableTextView(Context context) {
+        this(context, null);
+    }
+
+    public ExpandableTextView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ExpandableTextView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+        maxLines = getMaxLines();
+        collapse = new SpannableString(context.getString(R.string.collapse));
+        ClickableSpan span = new ClickableSpan() {
+            @Override
+            public void onClick(@NonNull View widget) {
+                TransitionManager.beginDelayedTransition((ViewGroup) getParent());
+                setMaxLines(nextLines);
+                ExpandableTextView.super.setText(text);
+            }
+        };
+        collapse.setSpan(span, 0, collapse.length(), 0);
+        expand = new SpannableString(context.getString(R.string.expand));
+        expand.setSpan(span, 0, expand.length(), 0);
+        setMovementMethod(LinkMovementMethod.getInstance());
+    }
+
+    @Override
+    public void setText(CharSequence text, BufferType type) {
+        this.text = text;
+        super.setText(text, type);
+    }
+
+    @Override
+    public boolean onPreDraw() {
+        var lineCount = getLayout().getLineCount();
+        if (lineCount > maxLines) {
+            SpannableString s;
+            int end;
+            if (maxLines == getMaxLines()) {
+                nextLines = lineCount + 1;
+                end = getLayout().getLineStart(getMaxLines() - 1);
+                s = expand;
+            } else {
+                nextLines = maxLines;
+                end = text.length();
+                s = collapse;
+            }
+            sb.clearSpans();
+            sb.clear();
+            sb.append(text, 0, end - 1);
+            sb.append("\n");
+            sb.append(s);
+            super.setText(sb, BufferType.NORMAL);
+        }
+        return super.onPreDraw();
+    }
+
+    @SuppressLint("ClickableViewAccessibility")
+    @Override
+    public boolean onTouchEvent(@NonNull MotionEvent event) {
+        Layout layout = this.getLayout();
+        if (layout != null) {
+            int line = layout.getLineForVertical((int) event.getY());
+            int offset = layout.getOffsetForHorizontal(line, event.getX());
+
+            if (getText() instanceof Spanned) {
+                Spanned spanned = (Spanned) getText();
+
+                ClickableSpan[] links = spanned.getSpans(offset, offset, ClickableSpan.class);
+
+                if (links.length == 0) {
+                    super.onTouchEvent(event);
+                    return false;
+                }
+            }
+        }
+
+        return super.onTouchEvent(event);
+    }
+
+}

app/src/main/res/layout/item_module.xml

@@ -35,6 +35,7 @@
         android:id="@+id/item_root"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:animateLayoutChanges="true"
         tools:ignore="RtlSymmetry">
 
         <ImageView
@@ -61,11 +62,12 @@
             app:layout_constraintTop_toTopOf="parent"
             tools:text="@tools:sample/first_names" />
 
-        <TextView
+        <org.lsposed.manager.ui.widget.ExpandableTextView
             android:id="@+id/description"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_gravity="center_vertical"
+            android:maxLines="5"
             android:textAppearance="?android:attr/textAppearanceListItemSecondary"
             android:textColor="?android:attr/textColorSecondary"
             app:layout_constraintBottom_toBottomOf="@id/hint"
@@ -114,8 +116,8 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:background="@android:color/transparent"
-            android:focusable="false"
             android:clickable="false"
+            android:focusable="false"
             android:visibility="gone"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"

app/src/main/res/values/strings.xml

@@ -221,4 +221,6 @@
     <string name="color_brown">Brown</string>
     <string name="color_grey">Grey</string>
     <string name="color_blue_grey">Blue grey</string>
+    <string name="expand">expand</string>
+    <string name="collapse">collapse</string>
 </resources>