[feat] support adaptive tablet layouts on Android and iPad

apps/android/README.md

@@ -13,7 +13,8 @@
 - 网络状态按视频、音频、数据、合计展示收发速率和丢包率，并显示实际提交帧率、分辨率、画面延时、平滑 RTT、P2P/TURN 和实际 SRTP 状态。每秒刷新，过期或无效测量显示“—”。
 - 可拖动的悬浮控制球、三列控制菜单和浮动 ASCII / 电脑键盘、常用快捷键；通过剪贴板发送中文等文本，再手动执行远端粘贴。
 - 设备身份与选择保存的连接密码使用 Android Keystore / AES-GCM 加密；首次联网需同意，后台切换会结束会话。
-- 与 iOS 一致的首页卡片、顶部状态/公告/设置入口、密码底部弹层、两列最近连接及分组设置页；最近连接按服务器隔离，长按可删除记录及密码。
+- 与 iOS 一致的首页卡片、顶部状态/公告/设置入口、密码弹层及分组设置页；最近连接按服务器隔离，长按可删除记录及密码。
+- 平板首页支持横竖屏和分屏，按当前可用宽度自动适配：900 dp 起连接与最近连接并排，较窄窗口纵向排列；最近连接随宽度显示 1–4 列，手机常规宽度仍为两列。首页最大宽度为 1200 dp，设置、公告及阅读页最大宽度为 720 dp，宽窗口中的密码和隐私弹窗居中限宽。旋转或调整分屏直接重排现有页面，保留输入、设置编辑和当前会话；手机全屏首页保持竖屏。
 - 页面转场沿用 iOS 的交互方式：设置、隐私、关于及公告页面进入时从右滑入，返回时反向滑出，背景页面轻微跟随；进入和退出远程会话使用 0.2 秒淡入淡出。遵循 Android 系统动画开关及速度设置。
 - 设置页的鼠标控制、画面偏好，以及悬浮控制栏的画质、帧率和画面偏好使用 0.2 秒的选中底块滑动动画；连续点击从当前位置转向，电脑端拒绝或超时后平滑回退，系统关闭动画时直接切换。
 - 通知公告与 iOS 共用信令协议，支持未读角标、分页、下拉刷新、更新推送、详情和网页链接；已读及删除状态按服务器、本机身份和公告版本保存在本机。

apps/android/app/src/main/AndroidManifest.xml

@@ -8,7 +8,8 @@
         android:dataExtractionRules="@xml/data_extraction_rules"
         android:supportsRtl="true" android:usesCleartextTraffic="false">
         <activity android:name=".MainActivity" android:exported="true"
-            android:configChanges="orientation|screenSize|keyboardHidden"
+            android:configChanges="orientation|screenSize|smallestScreenSize|screenLayout|keyboard|keyboardHidden"
+            android:resizeableActivity="true"
             android:windowSoftInputMode="adjustResize">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

apps/android/app/src/main/java/cn/crossdesk/mobile/HomeLayout.java

@@ -0,0 +1,46 @@
+package cn.crossdesk.mobile;
+
+import android.view.Gravity;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.ScrollView;
+
+/** Reflows the existing panels, keeping text, focus and scroll state during window resizing. */
+@android.annotation.SuppressLint("ViewConstructor")
+final class HomeLayout extends ScrollView {
+    final LinearLayout panels;
+    private final MobileUi ui;
+    private int panelHeight;
+
+    HomeLayout(MobileUi ui){
+        super(ui.context);this.ui=ui;
+        setFillViewport(true);setClipChildren(false);setClipToPadding(false);
+        panels=new LinearLayout(ui.context){
+            @Override protected void onMeasure(int widthSpec,int heightSpec){
+                // ScrollView offers unbounded height even with an explicit LayoutParams height.
+                super.onMeasure(widthSpec,MeasureSpec.makeMeasureSpec(panelHeight,MeasureSpec.EXACTLY));
+            }
+        };panels.setGravity(Gravity.TOP);
+        panels.setPadding(ui.dp(20),ui.dp(24),ui.dp(20),ui.dp(12));
+        panels.setClipChildren(false);panels.setClipToPadding(false);
+        addView(panels,new LayoutParams(-1,-1));
+    }
+
+    @Override protected void onMeasure(int widthSpec,int heightSpec){
+        boolean wide=MeasureSpec.getSize(widthSpec)>=ui.dp(900);
+        panels.setOrientation(wide?LinearLayout.HORIZONTAL:LinearLayout.VERTICAL);
+        // A short split window or the IME can leave less room than the two panels need.
+        // Keep the recent list usable and let the outer viewport scroll in that case.
+        panelHeight=Math.max(ui.dp(wide?360:440),MeasureSpec.getSize(heightSpec));
+        if(panels.getChildCount()==2){
+            View connection=panels.getChildAt(0),recent=panels.getChildAt(1);
+            LinearLayout.LayoutParams first=(LinearLayout.LayoutParams)connection.getLayoutParams();
+            first.width=wide?ui.dp(360):-1;first.height=-2;first.weight=0;first.gravity=Gravity.TOP;
+            LinearLayout.LayoutParams second=(LinearLayout.LayoutParams)recent.getLayoutParams();
+            second.width=wide?0:-1;second.height=wide?-1:0;second.weight=1;
+            second.topMargin=wide?0:ui.dp(20);second.setMarginStart(wide?ui.dp(24):0);
+            second.resolveLayoutDirection(panels.getLayoutDirection());
+        }
+        super.onMeasure(widthSpec,heightSpec);
+    }
+}

apps/android/app/src/main/java/cn/crossdesk/mobile/MainActivity.java

@@ -46,6 +46,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private RecentConnections history;
     private final RecentConnectionPresence recentPresence=new RecentConnectionPresence();
     private LinearLayout recentGrid;
+    private int recentColumns=2;
     private final Runnable presenceTick=new Runnable(){public void run(){
         if(!recentPresence.isConnected())return;
         recentPresence.maintain(android.os.SystemClock.elapsedRealtime());
@@ -114,8 +115,10 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         settingsUpdateDot=null;aboutUpdateDot=null;settingsUpdateButton=null;aboutUpdateRow=null;aboutUpdateLabel=null;
         previewSwitch=null;clearPreviewsButton=null;previewCleanupError=null;previewCards.clear();recentGrid=null;
         canvas=new FrameLayout(this);canvas.setBackgroundColor(dark?Color.BLACK:BACKGROUND);
-        root=column();canvas.addView(root,new FrameLayout.LayoutParams(-1,-1));
+        FrameLayout safeArea=new FrameLayout(this);canvas.addView(safeArea,new FrameLayout.LayoutParams(-1,-1));
-        root.setOnApplyWindowInsetsListener((view,insets)->{
+        root=ui.pageColumn(dark?0:nextPage.equals("home")?1200:720);
+        safeArea.addView(root,new FrameLayout.LayoutParams(-1,-1,Gravity.TOP|Gravity.CENTER_HORIZONTAL));
+        safeArea.setOnApplyWindowInsetsListener((view,insets)->{
             view.setPadding(insets.getSystemWindowInsetLeft(),insets.getSystemWindowInsetTop(),insets.getSystemWindowInsetRight(),insets.getSystemWindowInsetBottom());return insets;
         });
         root.setFocusableInTouchMode(true);pageHost.show(canvas,motion);
@@ -155,9 +158,18 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         TextView chevron=text(" ›",23,false);chevron.setTextColor(0xFFB7B7BD);item.addView(chevron);item.setContentDescription(title+(detail.isEmpty()?"":"，"+detail));item.setClickable(true);item.setFocusable(true);item.setOnClickListener(v->action.run());parent.addView(item);
         return item;
     }
-    @android.annotation.SuppressLint("SourceLockedOrientationActivity") // Match the iOS portrait home; sessions support both orientations.
+    @android.annotation.SuppressLint("SourceLockedOrientationActivity") // Phones keep the portrait home; tablets and multi-window follow user rotation settings.
+    private void updateHomeOrientation(){
+        boolean tablet=getResources().getConfiguration().smallestScreenWidthDp>=600;
+        if(android.os.Build.VERSION.SDK_INT>=30){
+            android.graphics.Rect bounds=getWindowManager().getMaximumWindowMetrics().getBounds();
+            tablet|=Math.min(bounds.width(),bounds.height())>=dp(600);
+        }
+        int orientation=tablet||isInMultiWindowMode()?ActivityInfo.SCREEN_ORIENTATION_FULL_USER:ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
+        if(getRequestedOrientation()!=orientation)setRequestedOrientation(orientation);
+    }
     private void home(String message){
-        backAction=null;setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);installRoot("home",false);
+        backAction=null;updateHomeOrientation();installRoot("home",false);
         LinearLayout toolbar=row();toolbar.setPadding(dp(20),0,dp(20),0);root.addView(toolbar,ui.size(-1,56));
         signalBadge=text("",12,true);signalBadge.setGravity(Gravity.CENTER);signalBadge.setPadding(dp(11),0,dp(11),0);signalBadge.setSingleLine(true);
         signalBadge.setOnClickListener(v->{
@@ -173,7 +185,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         TextView updateBadge=text("!",10,true);updateBadge.setTextColor(Color.WHITE);updateBadge.setGravity(Gravity.CENTER);updateBadge.setIncludeFontPadding(false);updateBadge.setBackground(ui.background(RED,8));updateBadge.setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_NO);settingsUpdateDot=updateBadge;
         FrameLayout.LayoutParams updatePosition=new FrameLayout.LayoutParams(dp(16),dp(16),Gravity.TOP|Gravity.END);updatePosition.topMargin=-dp(3);updatePosition.setMarginEnd(-dp(5));settingsButton.addView(settingsUpdateDot,updatePosition);
         toolbar.addView(settingsButton,ui.size(40,40));renderAppUpdates();
-        LinearLayout content=column();content.setPadding(dp(20),dp(24),dp(20),dp(12));content.setClipChildren(false);content.setClipToPadding(false);root.addView(content,new LinearLayout.LayoutParams(-1,0,1));
+        HomeLayout layout=new HomeLayout(ui);root.addView(layout,new LinearLayout.LayoutParams(-1,0,1));LinearLayout content=layout.panels;
         LinearLayout connection=column();connection.setPadding(dp(18),dp(18),dp(18),dp(18));content.addView(ui.shadowCard(connection,20));
         connection.addView(text("远程桌面",20,true));ui.gap(connection,16);
         LinearLayout entry=row();connection.addView(entry,ui.size(-1,54));
@@ -191,7 +203,12 @@ public final class MainActivity extends Activity implements NativeSession.Listen
             LinearLayout empty=column();empty.setGravity(Gravity.CENTER);recent.addView(empty,new LinearLayout.LayoutParams(-1,0,1));empty.addView(ui.icon("history",0xFFB6B6BB),ui.size(34,34));ui.gap(empty,12);
             TextView emptyTitle=text("还没有连接记录",17,true);emptyTitle.setGravity(Gravity.CENTER);empty.addView(emptyTitle);ui.gap(empty,8);TextView hint=text("成功连接后，这里会显示最近的远程设备。",13,false);hint.setTextColor(SECONDARY);hint.setGravity(Gravity.CENTER);empty.addView(hint);
         }else{
-            ui.gap(recent,14);ScrollView scroll=new ScrollView(this);recent.addView(scroll,new LinearLayout.LayoutParams(-1,0,1));recentGrid=column();scroll.addView(recentGrid);renderRecentConnections();
+            ui.gap(recent,14);ScrollView scroll=new ScrollView(this);recent.addView(scroll,new LinearLayout.LayoutParams(-1,0,1));recentGrid=column();scroll.addView(recentGrid);
+            recentGrid.addOnLayoutChangeListener((view,left,top,right,bottom,oldLeft,oldTop,oldRight,oldBottom)->{
+                int width=right-left;if(width<=0)return;
+                int columns=width<dp(300)?1:Math.max(2,Math.min(4,(width+dp(12))/dp(192)));
+                if(columns!=recentColumns){recentColumns=columns;view.post(()->{if(view==recentGrid)renderRecentConnections();});}
+            });renderRecentConnections();
         }
         ensureSignaling();
         if(!message.isEmpty())new AlertDialog.Builder(this).setTitle("连接提示").setMessage(message).setPositiveButton("确定",null).show();
@@ -202,7 +219,7 @@ public final class MainActivity extends Activity implements NativeSession.Listen
         if(recentGrid==null)return;
         JSONArray records=recentPresence.ordered(history.list(serverKey()),android.os.SystemClock.elapsedRealtime());
         recentGrid.removeAllViews();previewCards.clear();
-        for(int i=0;i<records.length();i+=2){LinearLayout line=row();line.setGravity(Gravity.TOP);recentGrid.addView(line);for(int j=i;j<i+2;j++){View card=j<records.length()?recentCard(records.optJSONObject(j)):new View(this);LinearLayout.LayoutParams cell=new LinearLayout.LayoutParams(0,-2,1);if(j>i)cell.leftMargin=dp(12);line.addView(card,cell);}ui.gap(recentGrid,12);}
+        for(int i=0;i<records.length();i+=recentColumns){LinearLayout line=row();line.setGravity(Gravity.TOP);recentGrid.addView(line);for(int j=i;j<i+recentColumns;j++){View card=j<records.length()?recentCard(records.optJSONObject(j)):new View(this);LinearLayout.LayoutParams cell=new LinearLayout.LayoutParams(0,-2,1);if(j>i)cell.setMarginStart(dp(12));line.addView(card,cell);}ui.gap(recentGrid,12);}
     }
     private View recentCard(JSONObject item){
         if(item==null)return new View(this);String id=item.optString("id"),platform=item.optString("platform");
@@ -249,9 +266,16 @@ public final class MainActivity extends Activity implements NativeSession.Listen
             String secret=password.getText().toString();if(secret.isEmpty()||secret.length()>128||secret.contains("@")){password.setError("请输入有效访问密码");return;}
             rememberPassword=remember.isChecked();password.setText("");dialog.dismiss();begin(id,secret);
         });connect.setContentDescription("确认连接");sheet.addView(connect,ui.size(-1,48));
-        dialog.setContentView(sheet);Window window=dialog.getWindow();if(window!=null){window.setBackgroundDrawableResource(android.R.color.transparent);window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);window.setDimAmount(.22f);}dialog.show();if(window!=null){window.setLayout(-1,-2);window.setGravity(Gravity.BOTTOM);}password.requestFocus();if(!error.isEmpty())password.setError(error);
+        ScrollView scroll=new ScrollView(this);scroll.addView(sheet);
+        dialog.setContentView(scroll);Window window=dialog.getWindow();if(window!=null){window.setBackgroundDrawableResource(android.R.color.transparent);window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);window.setDimAmount(.22f);}dialog.show();sizePasswordDialog();password.requestFocus();if(!error.isEmpty())password.setError(error);
         dialog.setOnDismissListener(d->{password.setText("");passwordDialog=null;});
     }
+    private void sizePasswordDialog(){
+        if(passwordDialog==null||passwordDialog.getWindow()==null)return;
+        int width=getResources().getConfiguration().screenWidthDp;
+        Window window=passwordDialog.getWindow();window.setLayout(width>=600?dp(Math.min(520,width-48)):-1,-2);
+        window.setGravity(width>=600?Gravity.CENTER:Gravity.BOTTOM);
+    }
     private void begin(String id,String secret){
         resetRemoteVersionCheck();
         resetVideoSettings();
@@ -538,7 +562,14 @@ public final class MainActivity extends Activity implements NativeSession.Listen
     private void back(){pageHost.finish();if(session!=null){if(ready)confirmDisconnect();else end("");}else if(backAction!=null)navigateBack();else finish();}
     @Override public void onWindowFocusChanged(boolean focus){super.onWindowFocusChanged(focus);if(!focus)releaseKeys();else applySystemBars(ready);}
     @android.annotation.SuppressLint("GestureBackNavigation") @Override public void onBackPressed(){back();}
-    @Override public void onConfigurationChanged(Configuration config){super.onConfigurationChanged(config);if(controls!=null)controls.post(controls::constrainPanels);}
+    @Override public void onConfigurationChanged(Configuration config){
+        super.onConfigurationChanged(config);
+        releaseKeys();
+        if(!page.equals("session"))updateHomeOrientation();
+        sizePasswordDialog();
+        if(privacyDialog instanceof PrivacyConsentDialog)((PrivacyConsentDialog)privacyDialog).updateSize();
+        if(controls!=null)controls.post(controls::constrainPanels);
+    }
     // onStart marks a new visit; focus/resume callbacks must not reopen a refused notice.
     @Override protected void onStart(){super.onStart();foreground=true;appUpdates.setEnabled(preferences.getBoolean("networkConsent",false));if(!preferences.getBoolean("networkConsent",false))consent(this::renderSignaling);ensureSignaling();}
     @Override protected void onStop(){foreground=false;appUpdates.setEnabled(false);if(privacyDialog!=null)privacyDialog.dismiss();pageHost.finish();if(session!=null)end(isFinishing()?"":"应用已进入后台，会话已结束");stopSignaling();super.onStop();}

apps/android/app/src/main/java/cn/crossdesk/mobile/MobileUi.java

@@ -29,6 +29,16 @@ final class MobileUi {
         return wrapper;
     }
     LinearLayout column() { LinearLayout v=new LinearLayout(context);v.setOrientation(LinearLayout.VERTICAL);return v; }
+    LinearLayout pageColumn(int maxWidth) {
+        LinearLayout v=new LinearLayout(context){
+            @Override protected void onMeasure(int widthSpec,int heightSpec){
+                if(maxWidth>0&&MeasureSpec.getSize(widthSpec)>dp(maxWidth))
+                    widthSpec=MeasureSpec.makeMeasureSpec(dp(maxWidth),MeasureSpec.EXACTLY);
+                super.onMeasure(widthSpec,heightSpec);
+            }
+        };
+        v.setOrientation(LinearLayout.VERTICAL);return v;
+    }
     LinearLayout row() { LinearLayout v=new LinearLayout(context);v.setGravity(Gravity.CENTER_VERTICAL);return v; }
     TextView text(String title,int size,boolean bold) {
         TextView v=new TextView(context);v.setText(title);v.setTextSize(size);v.setTextColor(INK);v.setIncludeFontPadding(false);

apps/android/app/src/main/java/cn/crossdesk/mobile/PrivacyConsentDialog.java

@@ -12,11 +12,13 @@ import static cn.crossdesk.mobile.MobileUi.*;
 
 /** Explicit agreement is required; refusal dismisses only the current visit. */
 final class PrivacyConsentDialog extends Dialog {
+    private final Activity activity;
+    private final MobileUi ui;
     PrivacyConsentDialog(Activity activity,MobileUi ui,Runnable accepted){
         this(activity,ui,new PrivacyPolicyDocument(activity),accepted);
     }
     PrivacyConsentDialog(Activity activity,MobileUi ui,PrivacyPolicyDocument policy,Runnable accepted){
-        super(activity);requestWindowFeature(Window.FEATURE_NO_TITLE);setCancelable(false);setCanceledOnTouchOutside(false);
+        super(activity);this.activity=activity;this.ui=ui;requestWindowFeature(Window.FEATURE_NO_TITLE);setCancelable(false);setCanceledOnTouchOutside(false);
         LinearLayout sheet=ui.column();sheet.setBackground(ui.background(android.graphics.Color.WHITE,20));sheet.setClipToOutline(true);
         TextView title=ui.text("隐私政策",17,true);title.setGravity(Gravity.CENTER);sheet.addView(title,ui.size(-1,56));ui.divider(sheet);
         sheet.addView(policy.view(ui),new LinearLayout.LayoutParams(-1,0,1));ui.divider(sheet);
@@ -31,6 +33,15 @@ final class PrivacyConsentDialog extends Dialog {
         setContentView(sheet);Window window=getWindow();if(window!=null){window.setBackgroundDrawableResource(android.R.color.transparent);window.setDimAmount(.22f);}
     }
     @Override public void show(){
-        super.show();Window window=getWindow();if(window!=null){window.setLayout(-1,Math.round(getContext().getResources().getDisplayMetrics().heightPixels*.9f));window.setGravity(Gravity.BOTTOM);}
+        super.show();updateSize();
+    }
+    void updateSize(){
+        android.content.res.Configuration configuration=activity.getResources().getConfiguration();
+        boolean wide=configuration.screenWidthDp>=600;
+        Window window=getWindow();if(window!=null){
+            window.setLayout(wide?ui.dp(Math.min(640,configuration.screenWidthDp-48)):-1,
+                    Math.min(ui.dp(760),Math.round(ui.dp(configuration.screenHeightDp)*.9f)));
+            window.setGravity(wide?Gravity.CENTER:Gravity.BOTTOM);
+        }
     }
 }

apps/android/app/src/main/java/cn/crossdesk/mobile/SessionControls.java

@@ -20,6 +20,8 @@ final class SessionControls extends FrameLayout {
     private final LinearLayout waiting;
     private View shield;
     private LinearLayout menu,keyboard;
+    private ScrollView keyboardKeys;
+    private int keyboardPreferredHeight;
     private TextView networkLabel,videoFeedback;
     private String menuPage="controls";
     private RemoteNetworkStatistics.Snapshot network=new RemoteNetworkStatistics().snapshot(0);
@@ -136,14 +138,21 @@ final class SessionControls extends FrameLayout {
     private int panelWidth(int width){return Math.max(1,Math.min(width-ui.dp(16),Math.max(ui.dp(280),Math.min(ui.dp(340),width-ui.dp(160)))));}
     private int panelHeight(int height){return Math.min(ui.dp(310),Math.max(1,height-ui.dp(16)));}
     private void positionMenu(){if(menu==null)return;float ox=orb.getX()+orb.getWidth()/2f;float x=ox>getWidth()/2f?orb.getX()-ui.dp(12)-menu.getWidth():orb.getX()+orb.getWidth()+ui.dp(12);menu.setX(bound(x,ui.dp(8),getWidth()-menu.getWidth()-ui.dp(8)));menu.setY(bound(orb.getY(),ui.dp(8),getHeight()-menu.getHeight()-ui.dp(8)));}
-    private void closeKeyboard(){if(keyboard!=null){removeView(keyboard);keyboard=null;}}
+    private int keyboardWidth(int width){return Math.min(ui.dp(computerKeyboard?520:440),Math.max(1,width-ui.dp(16)));}
+    private int keyboardHeight(int height){return Math.min(keyboardPreferredHeight,Math.max(1,height-ui.dp(16)));}
+    private void positionKeyboard(){if(keyboard!=null){keyboard.setX(bound(keyboard.getX(),ui.dp(8),getWidth()-keyboard.getWidth()-ui.dp(8)));keyboard.setY(bound(keyboard.getY(),ui.dp(8),getHeight()-keyboard.getHeight()-ui.dp(8)));}}
+    private void closeKeyboard(){if(keyboard!=null){removeView(keyboard);keyboard=null;keyboardKeys=null;}}
     private void toggleKeyboard(){if(keyboard!=null){closeKeyboard();modifiers.clear();return;}modifiers.clear();showKeyboard();}
     private void showKeyboard(){
-        float oldX=keyboard==null?-1:keyboard.getX(),oldY=keyboard==null?-1:keyboard.getY();closeKeyboard();keyboard=ui.column();keyboard.setPadding(ui.dp(5),ui.dp(5),ui.dp(5),ui.dp(5));keyboard.setBackground(ui.background(0xFFD1D6DE,12));keyboard.setElevation(ui.dp(10));
+        float oldX=keyboard==null?-1:keyboard.getX(),oldY=keyboard==null?-1:keyboard.getY();int oldScroll=keyboardKeys==null?0:keyboardKeys.getScrollY();closeKeyboard();keyboard=ui.column();keyboard.setPadding(ui.dp(5),ui.dp(5),ui.dp(5),ui.dp(5));keyboard.setBackground(ui.background(0xFFD1D6DE,12));keyboard.setElevation(ui.dp(10));
         LinearLayout top=ui.row();TextView handle=ui.text("━",19,true);handle.setGravity(Gravity.CENTER);handle.setTextColor(SECONDARY);handle.setContentDescription("拖动键盘");top.addView(handle,new LinearLayout.LayoutParams(0,ui.dp(28),1));top.addView(ui.iconButton("close","收起键盘",this::closeKeyboard),ui.size(30,28));keyboard.addView(top);drag(handle,keyboard,()->{});
+        // Keep the drag/close row fixed while short split windows can scroll every key into view.
+        keyboardKeys=new ScrollView(getContext());keyboard.addView(keyboardKeys,new LinearLayout.LayoutParams(-1,0,1));LinearLayout keys=ui.column();keyboardKeys.addView(keys);
         String[][] rows=computerKeyboard?new String[][]{{"Esc","F1","F2","F3","F4","F5","F6"},{"Tab","Ctrl","Alt","Win","↑","⌫"},{"复制","粘贴","全选","←","↓","→"},{"ABC","空格","Enter"}}:new String[][]{{"1","2","3","4","5","6","7","8","9","0"},{"q","w","e","r","t","y","u","i","o","p"},{"a","s","d","f","g","h","j","k","l"},{"⇧","z","x","c","v","b","n","m","⌫"},{"电脑","剪贴板","空格",".","Enter"}};
-        for(String[] values:rows){LinearLayout line=ui.row();for(String value:values){String shown=shift&&value.length()==1?value.toUpperCase(java.util.Locale.ROOT):value;TextView key=ui.action(shown,INK,()->keyboardKey(value));key.setTextSize(value.length()>2?11:14);key.setMinHeight(ui.dp(31));int modifier=value.equals("Ctrl")?17:value.equals("Alt")?18:value.equals("Win")?91:0;key.setBackground(ui.background(modifiers.contains(modifier)?0xFF9BC7F7:value.length()>1||value.equals("⇧")?0xFFAFB8C5:Color.WHITE,5));LinearLayout.LayoutParams p=new LinearLayout.LayoutParams(0,ui.dp(31),value.equals("空格")?3:1);p.setMargins(ui.dp(1.5f),0,ui.dp(1.5f),0);line.addView(key,p);}keyboard.addView(line);ui.gap(keyboard,3);}
+        for(String[] values:rows){LinearLayout line=ui.row();for(String value:values){String shown=shift&&value.length()==1?value.toUpperCase(java.util.Locale.ROOT):value;TextView key=ui.action(shown,INK,()->keyboardKey(value));key.setTextSize(value.length()>2?11:14);key.setMinHeight(ui.dp(31));int modifier=value.equals("Ctrl")?17:value.equals("Alt")?18:value.equals("Win")?91:0;key.setBackground(ui.background(modifiers.contains(modifier)?0xFF9BC7F7:value.length()>1||value.equals("⇧")?0xFFAFB8C5:Color.WHITE,5));LinearLayout.LayoutParams p=new LinearLayout.LayoutParams(0,ui.dp(31),value.equals("空格")?3:1);p.setMargins(ui.dp(1.5f),0,ui.dp(1.5f),0);line.addView(key,p);}keys.addView(line);ui.gap(keys,3);}
-        int width=Math.min(ui.dp(computerKeyboard?520:440),Math.max(1,getWidth()-ui.dp(16)));addView(keyboard,new LayoutParams(width,-2));keyboard.post(()->{if(keyboard!=null){keyboard.setX(oldX<0?(getWidth()-keyboard.getWidth())/2f:oldX);keyboard.setY(oldY<0?getHeight()-keyboard.getHeight()-ui.dp(20):oldY);constrainPanels();}});
+        keyboardPreferredHeight=ui.dp(5)*2+ui.dp(28)+rows.length*(ui.dp(31)+ui.dp(3));
+        addView(keyboard,new LayoutParams(keyboardWidth(getWidth()),keyboardHeight(getHeight())));LinearLayout shownKeyboard=keyboard;ScrollView shownKeys=keyboardKeys;
+        keyboard.post(()->{if(keyboard==shownKeyboard){keyboard.setX(oldX<0?(getWidth()-keyboard.getWidth())/2f:oldX);keyboard.setY(oldY<0?getHeight()-keyboard.getHeight()-ui.dp(20):oldY);shownKeys.scrollTo(0,oldScroll);constrainPanels();}});
     }
     private void keyboardKey(String value){
         switch(value){
@@ -177,16 +186,22 @@ final class SessionControls extends FrameLayout {
     }
     void constrainPanels(){
         orb.setX(bound(orb.getX(),ui.dp(8),getWidth()-orb.getWidth()-ui.dp(8)));orb.setY(bound(orb.getY(),ui.dp(8),getHeight()-orb.getHeight()-ui.dp(8)));
-        if(menu!=null)requestLayout();
+        if(menu!=null||keyboard!=null)requestLayout();
-        if(keyboard!=null){ViewGroup.LayoutParams p=keyboard.getLayoutParams();p.width=Math.min(ui.dp(computerKeyboard?520:440),Math.max(1,getWidth()-ui.dp(16)));keyboard.setLayoutParams(p);keyboard.setX(bound(keyboard.getX(),ui.dp(8),getWidth()-p.width-ui.dp(8)));keyboard.setY(bound(keyboard.getY(),ui.dp(8),getHeight()-keyboard.getHeight()-ui.dp(8)));}
+        positionKeyboard();
     }
     @Override protected void onMeasure(int widthSpec,int heightSpec){
         super.onMeasure(widthSpec,heightSpec);
+        boolean resized=false;
         if(menu!=null){
             // Use this traversal's viewport, including rotation/inset changes, before drawing.
             ViewGroup.LayoutParams p=menu.getLayoutParams();int width=panelWidth(getMeasuredWidth()),height=panelHeight(getMeasuredHeight());
-            if(p.width!=width||p.height!=height){p.width=width;p.height=height;super.onMeasure(widthSpec,heightSpec);}
+            if(p.width!=width||p.height!=height){p.width=width;p.height=height;resized=true;}
         }
+        if(keyboard!=null){
+            ViewGroup.LayoutParams p=keyboard.getLayoutParams();int width=keyboardWidth(getMeasuredWidth()),height=keyboardHeight(getMeasuredHeight());
+            if(p.width!=width||p.height!=height){p.width=width;p.height=height;resized=true;}
+        }
+        if(resized)super.onMeasure(widthSpec,heightSpec);
     }
     @Override protected void onLayout(boolean changed,int left,int top,int right,int bottom){
         super.onLayout(changed,left,top,right,bottom);
@@ -194,6 +209,7 @@ final class SessionControls extends FrameLayout {
         orb.setX(bound(orb.getX(),ui.dp(8),getWidth()-orb.getWidth()-ui.dp(8)));orb.setY(bound(orb.getY(),ui.dp(8),getHeight()-orb.getHeight()-ui.dp(8)));
         // New/rebuilt menus have real dimensions now; position them in the same frame.
         positionMenu();
+        positionKeyboard();
     }
     @Override protected void onSizeChanged(int width,int height,int oldWidth,int oldHeight){super.onSizeChanged(width,height,oldWidth,oldHeight);post(this::constrainPanels);}
     private static float bound(float value,float min,float max){return Math.max(min,Math.min(value,Math.max(min,max)));}

apps/ios/CrossDeskMobile/AnnouncementInboxView.swift

@@ -108,6 +108,8 @@ struct AnnouncementInboxView: View {
                 Text("共 \(inbox.state.total) 条 · \(inbox.state.unread) 条未读")
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("通知公告")
         .navigationBarTitleDisplayMode(.inline)
         .toolbar {
@@ -174,10 +176,12 @@ struct AnnouncementDetailView: View {
                         })
                 }
                 .padding(20)
+                .readableContentWidth()
             } else {
                 Text("这条公告已更新或删除，请返回公告列表查看。")
                     .foregroundStyle(.secondary)
                     .padding(20)
+                    .readableContentWidth()
             }
         }
         .navigationTitle("公告详情")

apps/ios/CrossDeskMobile/ContentView.swift

@@ -1,6 +1,19 @@
 import SwiftUI
 import UIKit
 
+enum MobileLayout {
+    static let twoColumnBreakpoint: CGFloat = 900
+    static let homeMaximumWidth: CGFloat = 1200
+    static let readableMaximumWidth: CGFloat = 720
+}
+
+extension View {
+    func readableContentWidth() -> some View {
+        frame(maxWidth: MobileLayout.readableMaximumWidth)
+            .frame(maxWidth: .infinity)
+    }
+}
+
 enum HomeDestination: Hashable {
     case settings
     case announcements
@@ -207,8 +220,11 @@ private struct ConnectionHomeView: View {
         return "arrow.triangle.2.circlepath"
     }
 
-    private var recentConnectionColumns: [GridItem] {
+    private func recentConnectionColumns(windowWidth: CGFloat) -> [GridItem] {
-        [
+        if windowWidth >= 600 {
+            return [GridItem(.adaptive(minimum: 180), spacing: 12, alignment: .top)]
+        }
+        return [
             GridItem(.flexible(), spacing: 12, alignment: .top),
             GridItem(.flexible(), spacing: 12, alignment: .top)
         ]
@@ -229,15 +245,33 @@ private struct ConnectionHomeView: View {
         ZStack {
             Color(.systemGroupedBackground).ignoresSafeArea()
 
-            VStack(spacing: 0) {
+            GeometryReader { proxy in
-                remoteConnectionPanel
+                let isWide = proxy.size.width >= MobileLayout.twoColumnBreakpoint
+                // AnyLayout keeps the fields, focus and scroll view alive when
+                // rotation or iPad multitasking crosses the layout breakpoint.
+                let layout = isWide
+                    ? AnyLayout(HStackLayout(alignment: .top, spacing: 24))
+                    : AnyLayout(VStackLayout(spacing: 20))
+
+                ScrollView(.vertical) {
+                    layout {
+                        remoteConnectionPanel
+                            .frame(width: isWide ? 360 : nil)
+                        recentConnectionsPanel(windowWidth: proxy.size.width)
+                            .frame(maxHeight: .infinity)
+                    }
+                    .frame(maxWidth: MobileLayout.homeMaximumWidth)
+                    // Short multitasking windows and the onscreen keyboard
+                    // must not squeeze the recent list below a usable height.
+                    .frame(height: max(isWide ? 260 : 420, proxy.size.height - 36),
+                           alignment: .top)
+                    .frame(maxWidth: .infinity)
+                    .padding(.horizontal, 20)
                     .padding(.top, 24)
-                recentConnectionsPanel
+                    .padding(.bottom, 12)
-                    .padding(.top, 20)
+                }
-                    .frame(maxHeight: .infinity)
+                .scrollDismissesKeyboard(.interactively)
             }
-            .padding(.horizontal, 20)
-            .padding(.bottom, 12)
 
             if session.isConnecting {
                 connectionProgressOverlay
@@ -430,7 +464,7 @@ private struct ConnectionHomeView: View {
     }
 
     @ViewBuilder
-    private var recentConnectionsPanel: some View {
+    private func recentConnectionsPanel(windowWidth: CGFloat) -> some View {
         VStack(alignment: .leading, spacing: 14) {
             HStack(alignment: .firstTextBaseline) {
                 Text("最近连接")
@@ -458,7 +492,7 @@ private struct ConnectionHomeView: View {
                 .frame(maxWidth: .infinity, maxHeight: .infinity)
             } else {
                 ScrollView(.vertical) {
-                    LazyVGrid(columns: recentConnectionColumns, spacing: 12) {
+                    LazyVGrid(columns: recentConnectionColumns(windowWidth: windowWidth), spacing: 12) {
                         ForEach(orderedRecentConnections) { connection in
                             RecentConnectionCard(
                                 connection: connection,
@@ -872,6 +906,8 @@ private struct ServerSettingsView: View {
                 .accessibilityLabel(appUpdates.updateAvailable ? "关于，有新版本" : "关于")
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("设置")
         .navigationBarTitleDisplayMode(.inline)
         .scrollDismissesKeyboard(.interactively)

apps/ios/CrossDeskMobile/CrossDeskMobileApp.swift

@@ -2,7 +2,8 @@ import SwiftUI
 import UIKit
 
 final class CrossDeskAppDelegate: NSObject, UIApplicationDelegate {
-    static var supportedOrientations: UIInterfaceOrientationMask = .portrait
+    static var supportedOrientations: UIInterfaceOrientationMask =
+        UIDevice.current.userInterfaceIdiom == .pad ? .all : .portrait
 
     func application(_ application: UIApplication,
                      supportedInterfaceOrientationsFor window: UIWindow?)
@@ -14,6 +15,10 @@ final class CrossDeskAppDelegate: NSObject, UIApplicationDelegate {
 enum AppOrientation {
     static func update(to orientations: UIInterfaceOrientationMask) {
         DispatchQueue.main.async {
+            // iPad windows can rotate and resize independently of the session.
+            // Keep all orientations available and let the window manager choose
+            // the geometry; the phone still locks the home screen to portrait.
+            guard UIDevice.current.userInterfaceIdiom != .pad else { return }
             CrossDeskAppDelegate.supportedOrientations = orientations
 
             for case let scene as UIWindowScene in UIApplication.shared.connectedScenes {

apps/ios/CrossDeskMobile/PrivacyViews.swift

@@ -10,6 +10,7 @@ struct PrivacyConsentView: View {
                 PrivacyPolicyDocument()
                     .padding(.horizontal, 20)
                     .padding(.vertical, 20)
+                    .readableContentWidth()
             }
             .background(Color(.systemBackground))
             .safeAreaInset(edge: .bottom, spacing: 0) {
@@ -57,6 +58,7 @@ struct PrivacyConsentView: View {
             }
             .padding(.horizontal, 20)
             .padding(.vertical, 12)
+            .readableContentWidth()
         }
         .background(Color(.systemBackground))
     }
@@ -161,6 +163,8 @@ private struct PrivacyAuthorizationView: View {
                 }
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("隐私与授权")
         .navigationBarTitleDisplayMode(.inline)
         .alert("是否撤回隐私授权？", isPresented: $confirmWithdrawal) {
@@ -220,7 +224,7 @@ private struct PrivacyPolicyDocument: View {
 struct PrivacyPolicyView: View {
     var body: some View {
         ScrollView {
-            PrivacyPolicyDocument().padding()
+            PrivacyPolicyDocument().padding().readableContentWidth()
         }
         .navigationTitle("隐私政策")
         .navigationBarTitleDisplayMode(.inline)

apps/ios/CrossDeskMobile/ThirdPartyLicensesView.swift

@@ -138,6 +138,8 @@ struct ThirdPartyLicensesView: View {
                 .padding()
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("关于 CrossDesk")
         .navigationBarTitleDisplayMode(.inline)
         .onChange(of: session.hasNetworkConsent) { allowed in
@@ -189,6 +191,8 @@ private struct OpenSourceComponentsView: View {
                 Text("各组件遵循所列开源许可证，其授予的权利不受本应用普通使用条款限制。查看源码需要网络连接。")
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("开源组件")
         .navigationBarTitleDisplayMode(.inline)
     }
@@ -217,6 +221,8 @@ private struct SourceCodeView: View {
                 }
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle("源码与构建说明")
         .navigationBarTitleDisplayMode(.inline)
     }
@@ -240,6 +246,7 @@ private struct ComponentLicenseView: View {
                 ForEach(component.documents) { document in
                     NavigationLink {
                         LicenseTextView(text: document.text)
+                            .readableContentWidth()
                             .navigationTitle(documentTitle(document.title))
                             .navigationBarTitleDisplayMode(.inline)
                     } label: {
@@ -248,6 +255,8 @@ private struct ComponentLicenseView: View {
                 }
             }
         }
+        .readableContentWidth()
+        .background(Color(.systemGroupedBackground).ignoresSafeArea())
         .navigationTitle(component.name)
         .navigationBarTitleDisplayMode(.inline)
     }

apps/ios/README.md

@@ -148,6 +148,17 @@ No Apple signing secrets are needed. Sign the app yourself before installing
 it on a device. Push any referenced MiniRTC commit before the parent repository
 so the runner can check out all corresponding sources.
 
+## iPad and adaptive layout
+
+iPad supports portrait, upside-down portrait, landscape and resizable multitasking
+windows on both the home screen and an active remote session. The home screen
+uses two columns at a window width of 900 points or more, with the connection
+form beside recent connections; smaller windows use a single column. Content is
+centered at a maximum width of 1200 points, and recent-connection cards adapt to
+the available space. Settings and reading pages are limited to 720 points.
+Resizing preserves the connection fields and active session. iPhone retains its
+portrait home screen and two-column recent-connection grid.
+
 ## App updates
 
 After network consent, the app checks the public version manifest once on each