feat(播放器): 添加可扩展的播放器视图和悬浮窗功能

实现播放器视图的扩展/折叠功能，根据内容自动调整高度
为iOS悬浮窗添加类似的可扩展功能，优化用户体验

lib/modules/translation/controllers/translation_controller.dart

@@ -61,6 +61,10 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
   late final Pip _pip;
   late final NativePlugin _nativePlugin;
   int _pipContentView = 0;
+  static const int _pipPreferredWidth = 375;
+  static const int _pipCompactPreferredHeight = 72;
+  static const int _pipExpandedPreferredHeight = 220;
+  bool _isPipExpanded = false;
 
   // ==================== 悬浮窗相关 ====================
   final isFloatingWindowEnabled = false.obs; // 悬浮窗状态
@@ -174,7 +178,10 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
             isFloatingWindowEnabled.value = state == PipState.pipStateStarted;
 
             if (state == PipState.pipStateFailed) {
+              _isPipExpanded = false;
               _pip.dispose();
+            } else if (state == PipState.pipStateStopped) {
+              _isPipExpanded = false;
             }
           },
         ),
@@ -190,6 +197,7 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
       if (Platform.isAndroid) {
         await _disableFloatingWindow();
       } else if (Platform.isIOS) {
+        _isPipExpanded = false;
         await _pip.dispose();
       }
     } else {
@@ -201,14 +209,11 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
     }
   }
 
-  Future<void> _startPip() async {
-    if (_pipContentView == 0) {
-      _pipContentView = await _nativePlugin.createPipContentView();
-    }
-    final options = PipOptions(
+  PipOptions _buildIosPipOptions({required int preferredHeight}) {
+    return PipOptions(
       autoEnterEnabled: true,
-      aspectRatioX: 375,
-      aspectRatioY: 400,
+      aspectRatioX: _pipPreferredWidth,
+      aspectRatioY: preferredHeight,
       sourceRectHintLeft: 0,
       sourceRectHintTop: 0,
       sourceRectHintRight: 0,
@@ -217,12 +222,19 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
       useExternalStateMonitor: true,
       externalStateMonitorInterval: 100,
       contentView: _pipContentView,
-      preferredContentWidth: 375,
-      preferredContentHeight: 400,
+      preferredContentWidth: _pipPreferredWidth,
+      preferredContentHeight: preferredHeight,
       controlStyle: 2,
     );
+  }
 
-    await _pip.setup(options);
+  Future<void> _startPip() async {
+    if (_pipContentView == 0) {
+      _pipContentView = await _nativePlugin.createPipContentView();
+    }
+    _isPipExpanded = false;
+    await _pip.setup(
+        _buildIosPipOptions(preferredHeight: _pipCompactPreferredHeight));
     await _pip.start();
   }
 
@@ -297,6 +309,17 @@ class TranslationController extends GetxController with WidgetsBindingObserver {
       );
       await _floatingWindowManager.updateFloatingWindowContent(data);
     } else if (Platform.isIOS) {
+      final hasContent = item.sourceText.trim().isNotEmpty ||
+          item.translatedText.trim().isNotEmpty;
+      if (hasContent && !_isPipExpanded) {
+        final ok = await _pip.setup(
+            _buildIosPipOptions(preferredHeight: _pipExpandedPreferredHeight));
+        if (ok) _isPipExpanded = true;
+      } else if (!hasContent && _isPipExpanded) {
+        final ok = await _pip.setup(
+            _buildIosPipOptions(preferredHeight: _pipCompactPreferredHeight));
+        if (ok) _isPipExpanded = false;
+      }
       await _nativePlugin.updatePipContentView({
         'viewId': _pipContentView,
         'cn': item.sourceText,

local_plugins/native_plugin/ios/Classes/PlayerView.swift

@@ -11,6 +11,9 @@ public class PlayerView: UIView {
   private let langRow: UIStackView = UIStackView()
   private var lastBoundsSize: CGSize = .zero
   private var lastLangText: String? = nil
+  private var isExpanded: Bool = false
+  private let compactPreferredHeight: CGFloat = 72
+  private let expandedPreferredHeight: CGFloat = 220
 
   public override init(frame: CGRect) {
     stackView = UIStackView()
@@ -73,12 +76,14 @@ public class PlayerView: UIView {
     cnLabel.textAlignment = .left
     cnLabel.numberOfLines = 0
     cnLabel.lineBreakMode = .byTruncatingTail
+    cnLabel.isHidden = true
 
     enLabel.font = .systemFont(ofSize: 15)
     enLabel.textColor = UIColor(red: 144.0 / 255.0, green: 202.0 / 255.0, blue: 249.0 / 255.0, alpha: 1.0)
     enLabel.textAlignment = .left
     enLabel.numberOfLines = 0
     enLabel.lineBreakMode = .byTruncatingTail
+    enLabel.isHidden = true
 
     let para = NSMutableParagraphStyle()
     para.lineSpacing = 2
@@ -110,7 +115,7 @@ public class PlayerView: UIView {
     stackView.addArrangedSubview(cnLabel)
     stackView.addArrangedSubview(enLabel)
 
-    layoutMargins = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
+    layoutMargins = UIEdgeInsets(top: 10, left: 16, bottom: 10, right: 16)
     addSubview(stackView)
 
     let guide = layoutMarginsGuide
@@ -141,11 +146,22 @@ public class PlayerView: UIView {
     if let en = en {
       enLabel.attributedText = NSAttributedString(string: en, attributes: [.paragraphStyle: para])
     }
+    let currentCn = cnLabel.attributedText?.string ?? ""
+    let currentEn = enLabel.attributedText?.string ?? ""
+    let hasContent =
+      !currentCn.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+      || !currentEn.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+    setExpanded(hasContent)
     setNeedsLayout()
   }
 
+  public override var intrinsicContentSize: CGSize {
+    CGSize(width: UIView.noIntrinsicMetric, height: isExpanded ? expandedPreferredHeight : compactPreferredHeight)
+  }
+
   public override func layoutSubviews() {
     super.layoutSubviews()
+    layer.cornerRadius = isExpanded ? 16 : 18
     layer.shadowPath = UIBezierPath(roundedRect: bounds, cornerRadius: layer.cornerRadius).cgPath
     let currentLangText = langLabel.text
     if bounds.size != lastBoundsSize || currentLangText != lastLangText {
@@ -155,6 +171,17 @@ public class PlayerView: UIView {
     }
   }
 
+  private func setExpanded(_ expanded: Bool) {
+    if expanded == isExpanded { return }
+    isExpanded = expanded
+    cnLabel.isHidden = !expanded
+    enLabel.isHidden = !expanded
+    layoutMargins = expanded
+      ? UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16)
+      : UIEdgeInsets(top: 10, left: 16, bottom: 10, right: 16)
+    invalidateIntrinsicContentSize()
+  }
+
   private func updateDynamicTextLineLimit() {
     let fittingWidth = max(0, bounds.width - layoutMargins.left - layoutMargins.right)
     if fittingWidth <= 0 { return }
@@ -182,7 +209,7 @@ public class PlayerView: UIView {
     let enLineHeight = enLabel.font.lineHeight * 1.1 + 2
     let combinedLineHeight = cnLineHeight + enLineHeight
 
-    let perLabelLines = max(1, min(Int(availableHeight / combinedLineHeight), 6))
+    let perLabelLines = max(1, min(Int(availableHeight / combinedLineHeight), 10))
 
     if perLabelLines != lastDynamicTextLines {
       lastDynamicTextLines = perLabelLines