Merge pull request #3 from flet-dev/s1-lazy-builders

S1 lazy builders

Author: FeodorFitsner

client/lib/controls/checkbox.dart

@@ -28,10 +28,17 @@ class CheckboxControl extends StatefulWidget {
 
 class _CheckboxControlState extends State<CheckboxControl> {
   bool? _value;
+  final FocusNode _focusNode = FocusNode();
 
   @override
   void initState() {
     super.initState();
+    _focusNode.addListener(() {
+      ws.pageEventFromWeb(
+          eventTarget: widget.control.id,
+          eventName: _focusNode.hasFocus ? "focus" : "blur",
+          eventData: "");
+    });
   }
 
   @override
@@ -50,6 +57,7 @@ class _CheckboxControlState extends State<CheckboxControl> {
             widget.control.attrString("labelPosition", "")!.toLowerCase(),
         orElse: () => LabelPosition.right);
     bool tristate = widget.control.attrBool("tristate", false)!;
+    bool autofocus = widget.control.attrBool("autofocus", false)!;
     bool disabled = widget.control.isDisabled || widget.parentDisabled;
 
     return StoreConnector<AppState, Function>(
@@ -66,7 +74,7 @@ class _CheckboxControlState extends State<CheckboxControl> {
 
           onChange(bool? value) {
             var svalue = value != null ? value.toString() : "";
-            debugPrint(svalue);
+            //debugPrint(svalue);
             setState(() {
               _value = value;
             });
@@ -83,6 +91,8 @@ class _CheckboxControlState extends State<CheckboxControl> {
           }
 
           var checkbox = Checkbox(
+              autofocus: autofocus,
+              focusNode: _focusNode,
               value: _value,
               tristate: tristate,
               onChanged: !disabled

client/lib/controls/clipboard.dart

@@ -0,0 +1,30 @@
+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
+
+import '../models/control.dart';
+
+class ClipboardControl extends StatelessWidget {
+  final Control? parent;
+  final Control control;
+
+  const ClipboardControl({Key? key, this.parent, required this.control})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    debugPrint("Clipboard build: ${control.id}");
+
+    var value = control.attrString("value");
+
+    if (value != null) {
+      debugPrint("Clipboard JSON value: $value");
+
+      var jv = json.decode(value);
+      Clipboard.setData(ClipboardData(text: jv["d"] as String?));
+    }
+
+    return const SizedBox.shrink();
+  }
+}

client/lib/controls/container.dart

@@ -1,13 +1,13 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 
+import '../models/control.dart';
 import '../utils/alignment.dart';
 import '../utils/borders.dart';
-import 'create_control.dart';
-import 'error.dart';
 import '../utils/colors.dart';
-import '../models/control.dart';
 import '../utils/edge_insets.dart';
+import 'create_control.dart';
+import 'error.dart';
 
 class ContainerControl extends StatelessWidget {
   final Control? parent;
@@ -25,7 +25,7 @@ class ContainerControl extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    debugPrint("Icon build: ${control.id}");
+    debugPrint("Container build: ${control.id}");
 
     var bgColor =
         HexColor.fromString(context, control.attrString("bgColor", "")!);

client/lib/controls/create_control.dart

@@ -8,6 +8,7 @@ import '../models/control_view_model.dart';
 import 'alert_dialog.dart';
 import 'banner.dart';
 import 'checkbox.dart';
+import 'clipboard.dart';
 import 'column.dart';
 import 'container.dart';
 import 'dropdown.dart';
@@ -45,17 +46,22 @@ import 'textfield.dart';
 // }
 
 Widget createControl(Control? parent, String id, bool parentDisabled) {
+  //debugPrint("createControl(): $id");
   return StoreConnector<AppState, ControlViewModel>(
     distinct: true,
     converter: (store) {
       //debugPrint("ControlViewModel $id converter");
       return ControlViewModel.fromStore(store, id);
     },
-    onWillChange: (prev, next) {
-      //debugPrint("${next.type} $id will change");
+    // onWillChange: (prev, next) {
+    //   debugPrint("onWillChange() $id: $prev, $next");
+    // },
+    ignoreChange: (state) {
+      //debugPrint("ignoreChange: $id");
+      return state.controls[id] == null;
     },
     builder: (context, controlView) {
-      //debugPrint("${control.type} ${control.id} builder");
+      //debugPrint("createControl builder(): $id");
       switch (controlView.control.type) {
         case ControlType.page:
           return PageControl(
@@ -64,6 +70,8 @@ Widget createControl(Control? parent, String id, bool parentDisabled) {
           return TextControl(control: controlView.control);
         case ControlType.icon:
           return IconControl(control: controlView.control);
+        case ControlType.clipboard:
+          return ClipboardControl(control: controlView.control);
         case ControlType.image:
           return ImageControl(parent: parent, control: controlView.control);
         case ControlType.progressRing:
@@ -205,12 +213,18 @@ Widget createControl(Control? parent, String id, bool parentDisabled) {
 }
 
 Widget baseControl(Widget widget, Control? parent, Control control) {
-  return _expandable(_opacity(widget, parent, control), parent, control);
+  return _expandable(
+      _tooltip(_opacity(widget, parent, control), parent, control),
+      parent,
+      control);
 }
 
 Widget constrainedControl(Widget widget, Control? parent, Control control) {
   return _expandable(
-      _sizedControl(_opacity(widget, parent, control), parent, control),
+      _sizedControl(
+          _tooltip(_opacity(widget, parent, control), parent, control),
+          parent,
+          control),
       parent,
       control);
 }
@@ -225,6 +239,18 @@ Widget _opacity(Widget widget, Control? parent, Control control) {
       : widget;
 }
 
+Widget _tooltip(Widget widget, Control? parent, Control control) {
+  var tooltip = control.attrString("tooltip");
+  return tooltip != null
+      ? Tooltip(
+          message: tooltip,
+          padding: const EdgeInsets.all(4.0),
+          child: widget,
+          waitDuration: const Duration(milliseconds: 800),
+        )
+      : widget;
+}
+
 Widget _sizedControl(Widget widget, Control? parent, Control control) {
   var width = control.attrDouble("width", null);
   var height = control.attrDouble("height", null);

client/lib/controls/dropdown.dart

@@ -28,6 +28,18 @@ class DropdownControl extends StatefulWidget {
 
 class _DropdownControlState extends State<DropdownControl> {
   String? _value;
+  final FocusNode _focusNode = FocusNode();
+
+  @override
+  void initState() {
+    super.initState();
+    _focusNode.addListener(() {
+      ws.pageEventFromWeb(
+          eventTarget: widget.control.id,
+          eventName: _focusNode.hasFocus ? "focus" : "blur",
+          eventData: "");
+    });
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -41,6 +53,7 @@ class _DropdownControlState extends State<DropdownControl> {
         builder: (context, itemsView) {
           debugPrint("Dropdown StoreConnector build: ${widget.control.id}");
 
+          bool autofocus = widget.control.attrBool("autofocus", false)!;
           bool disabled = widget.control.isDisabled || widget.parentDisabled;
 
           String? value = widget.control.attrString("value");
@@ -54,6 +67,8 @@ class _DropdownControlState extends State<DropdownControl> {
               itemsView.children.where((c) => c.name == "suffix");
 
           var dropDown = DropdownButtonFormField<String>(
+            autofocus: autofocus,
+            focusNode: _focusNode,
             value: _value,
             decoration: buildInputDecoration(
                 widget.control,

client/lib/controls/elevated_button.dart

@@ -29,6 +29,7 @@ class ElevatedButtonControl extends StatelessWidget {
     Color? iconColor =
         HexColor.fromString(context, control.attrString("iconColor", "")!);
     var contentCtrls = children.where((c) => c.name == "content");
+    bool autofocus = control.attrBool("autofocus", false)!;
     bool disabled = control.isDisabled || parentDisabled;
 
     Function()? onPressed = disabled
@@ -45,6 +46,7 @@ class ElevatedButtonControl extends StatelessWidget {
 
     if (icon != null) {
       button = ElevatedButton.icon(
+          autofocus: autofocus,
           onPressed: onPressed,
           icon: Icon(
             icon,
@@ -53,6 +55,7 @@ class ElevatedButtonControl extends StatelessWidget {
           label: Text(text));
     } else if (contentCtrls.isNotEmpty) {
       button = ElevatedButton(
+          autofocus: autofocus,
           onPressed: onPressed,
           child: createControl(control, contentCtrls.first.id, disabled));
     } else {

client/lib/controls/floating_action_button.dart

@@ -30,6 +30,7 @@ class FloatingActionButtonControl extends StatelessWidget {
     Color? bgColor =
         HexColor.fromString(context, control.attrString("bgColor", "")!);
     var contentCtrls = children.where((c) => c.name == "content");
+    bool autofocus = control.attrBool("autofocus", false)!;
     bool disabled = control.isDisabled || parentDisabled;
 
     Function()? onPressed = disabled
@@ -49,16 +50,19 @@ class FloatingActionButtonControl extends StatelessWidget {
     Widget button;
     if (contentCtrls.isNotEmpty) {
       button = FloatingActionButton(
+          autofocus: autofocus,
           onPressed: onPressed,
           child: createControl(control, contentCtrls.first.id, disabled));
     } else if (icon != null && text == null) {
       button = FloatingActionButton(
+        autofocus: autofocus,
         onPressed: onPressed,
         child: Icon(icon),
         backgroundColor: bgColor,
       );
     } else if (icon != null && text != null) {
       button = FloatingActionButton.extended(
+          autofocus: autofocus,
           onPressed: onPressed,
           label: Text(text),
           icon: Icon(icon),

client/lib/controls/grid_view.dart

@@ -26,21 +26,35 @@ class GridViewControl extends StatelessWidget {
 
     final horizontal = control.attrBool("horizontal", false)!;
     final runsCount = control.attrInt("runsCount", 1)!;
+    final maxExtent = control.attrDouble("maxExtent");
     final spacing = control.attrDouble("spacing", 10)!;
     final runSpacing = control.attrDouble("runSpacing", 10)!;
     final padding = parseEdgeInsets(control, "padding");
-
-    List<Widget> controls =
-        children.map((c) => createControl(control, c.id, disabled)).toList();
+    final childAspectRatio = control.attrDouble("childAspectRatio", 1)!;
+
+    List<Control> visibleControls = children.where((c) => c.isVisible).toList();
+
+    var gridDelegate = maxExtent == null
+        ? SliverGridDelegateWithFixedCrossAxisCount(
+            crossAxisCount: runsCount,
+            mainAxisSpacing: spacing,
+            crossAxisSpacing: runSpacing,
+            childAspectRatio: childAspectRatio)
+        : SliverGridDelegateWithMaxCrossAxisExtent(
+            maxCrossAxisExtent: maxExtent,
+            mainAxisSpacing: spacing,
+            crossAxisSpacing: runSpacing,
+            childAspectRatio: childAspectRatio);
 
     return constrainedControl(
-        GridView.count(
+        GridView.builder(
           scrollDirection: horizontal ? Axis.horizontal : Axis.vertical,
-          crossAxisCount: runsCount,
-          mainAxisSpacing: spacing,
-          crossAxisSpacing: runSpacing,
           padding: padding,
-          children: controls,
+          gridDelegate: gridDelegate,
+          itemCount: visibleControls.length,
+          itemBuilder: (context, index) {
+            return createControl(control, visibleControls[index].id, disabled);
+          },
         ),
         parent,
         control);

client/lib/controls/icon_button.dart

@@ -25,12 +25,12 @@ class IconButtonControl extends StatelessWidget {
   Widget build(BuildContext context) {
     debugPrint("Button build: ${control.id}");
 
-    String? tooltip = control.attrString("tooltip");
     IconData? icon = getMaterialIcon(control.attrString("icon", "")!);
     Color? iconColor =
         HexColor.fromString(context, control.attrString("iconColor", "")!);
     double? iconSize = control.attrDouble("iconSize");
     var contentCtrls = children.where((c) => c.name == "content");
+    bool autofocus = control.attrBool("autofocus", false)!;
     bool disabled = control.isDisabled || parentDisabled;
 
     Function()? onPressed = disabled
@@ -47,18 +47,18 @@ class IconButtonControl extends StatelessWidget {
 
     if (icon != null) {
       button = IconButton(
+          autofocus: autofocus,
           icon: Icon(
             icon,
             color: iconColor,
           ),
           iconSize: iconSize,
-          tooltip: tooltip,
           onPressed: onPressed);
     } else if (contentCtrls.isNotEmpty) {
       button = IconButton(
+          autofocus: autofocus,
           onPressed: onPressed,
           iconSize: iconSize,
-          tooltip: tooltip,
           icon: createControl(control, contentCtrls.first.id, disabled));
     } else {
       return const ErrorControl(