Feature/basic app (#1)

Feature/Basic App (#1)

Basic App Structure Consists of Time Progress Dashboard, Time Progress Detail View and Time Progress Creator.
All of these have an AppDrawer with a Link To the Dashboard and all your Track Time Progresses, also an About Button.

Commits:
* Undetailed Commit more work
* Changed isEditing ? in Detail Screen and Extracted FAB row to widget
* Extracted Progress Detail Fab Row and Progress Detail select Date Btn to
widgets
* Create Progress Detail Widgets Folder
* Extracted Edit Dates Row Widget
* Extracted Functions from ui
* Made some fields private
* LoadTimerProgressList if unloaded function
* Created App Yes No Dialog Widget
* Using Yes No Dialog in Detail Screen
* Created TimeProgress Initial Default factory
* Renamed to Time Progress Tracker
* Added About Button in App Drawer
* Code cleanup
* Code clean up and fixed Bug with null as string in Repository

Signed-off-by Andreas Fahrecker <AndreasFahrecker@gmail.com>

lib/widgets/progress_detail_widgets/progress_detail_circular_percent_widget.dart

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+import 'package:flutter/material.dart';
+import 'package:percent_indicator/circular_percent_indicator.dart';
+
+class ProgressDetailCircularPercent extends StatelessWidget {
+  final double percentDone;
+
+  ProgressDetailCircularPercent({Key key, @required this.percentDone})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return CircularPercentIndicator(
+      radius: 100,
+      lineWidth: 10,
+      percent: percentDone,
+      progressColor: Colors.green,
+      backgroundColor: Colors.red,
+      center: Text("${(percentDone * 100).floor()} %"),
+    );
+  }
+}

lib/widgets/progress_detail_widgets/progress_detail_edit_dates_row_widget.dart

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+import 'package:flutter/material.dart';
+import 'package:time_progress_tracker/widgets/progress_detail_widgets/progress_detail_select_date_btn_widget.dart';
+
+class ProgressDetailEditDatesRow extends StatelessWidget {
+  final DateTime startTime;
+  final DateTime endTime;
+  final void Function(DateTime) onStartTimeChanged;
+  final void Function(DateTime) onEndTimeChanged;
+
+  ProgressDetailEditDatesRow({
+    Key key,
+    @required this.startTime,
+    @required this.endTime,
+    @required this.onStartTimeChanged,
+    @required this.onEndTimeChanged,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: <Widget>[
+        Expanded(
+          flex: 5,
+          child: ProgressDetailSelectDateButton(
+            leadingString: "Start Date:",
+            selectedDate: startTime,
+            onDateSelected: onStartTimeChanged,
+          ),
+        ),
+        Spacer(
+          flex: 1,
+        ),
+        Expanded(
+          flex: 5,
+          child: ProgressDetailSelectDateButton(
+            leadingString: "End Date:",
+            selectedDate: endTime,
+            onDateSelected: onEndTimeChanged,
+          ),
+        )
+      ],
+    );
+  }
+}

lib/widgets/progress_detail_widgets/progress_detail_fab_editing_row_widget.dart

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+import 'package:flutter/material.dart';
+
+class ProgressDetailFabEditingRow extends StatelessWidget {
+  final void Function() onSave;
+  final void Function() onCancelEdit;
+
+  ProgressDetailFabEditingRow({
+    Key key,
+    @required this.onSave,
+    @required this.onCancelEdit,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: <Widget>[
+        Expanded(
+          child: FloatingActionButton(
+            heroTag: "saveEditedTimeProgressBTN",
+            child: Icon(Icons.save),
+            backgroundColor: Colors.green,
+            onPressed: this.onSave,
+          ),
+        ),
+        Expanded(
+            child: FloatingActionButton(
+          heroTag: "cancelEditTimeProgressBTN",
+          child: Icon(Icons.cancel),
+          backgroundColor: Colors.red,
+          onPressed: this.onCancelEdit,
+        ))
+      ],
+    );
+  }
+}

lib/widgets/progress_detail_widgets/progress_detail_fab_row_widget.dart

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+import 'package:flutter/material.dart';
+
+class ProgressDetailFabRow extends StatelessWidget {
+  final void Function() onEdit;
+  final void Function() onDelete;
+
+  ProgressDetailFabRow(
+      {Key key, @required this.onEdit, @required this.onDelete})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: <Widget>[
+        Expanded(
+          child: FloatingActionButton(
+            heroTag: "editTimeProgressBTN",
+            child: Icon(Icons.edit),
+            onPressed: onEdit,
+          ),
+        ),
+        Expanded(
+          child: FloatingActionButton(
+            heroTag: "deleteTimeProgressBTN",
+            child: Icon(Icons.delete),
+            backgroundColor: Colors.red,
+            onPressed: onDelete,
+          ),
+        )
+      ],
+    );
+  }
+}

lib/widgets/progress_detail_widgets/progress_detail_linear_percent_widget.dart

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+import 'package:flutter/material.dart';
+import 'package:percent_indicator/linear_percent_indicator.dart';
+import 'package:time_progress_tracker/models/time_progress.dart';
+
+class ProgressDetailLinearPercent extends StatelessWidget {
+  final TimeProgress timeProgress;
+
+  ProgressDetailLinearPercent({Key key, @required this.timeProgress})
+      : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return LinearPercentIndicator(
+      padding: EdgeInsets.symmetric(horizontal: 15),
+      percent: this.timeProgress.percentDone(),
+      leading: Text("${this.timeProgress.daysBehind()} Days"),
+      center: Text("${(this.timeProgress.percentDone() * 100).floor()} %"),
+      trailing: Text("${this.timeProgress.daysLeft()} Days"),
+      progressColor: Colors.green,
+      backgroundColor: Colors.red,
+      lineHeight: 25,
+    );
+  }
+}

lib/widgets/progress_detail_widgets/progress_detail_select_date_btn_widget.dart

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+import 'package:flutter/material.dart';
+
+class ProgressDetailSelectDateButton extends StatelessWidget {
+  final String leadingString;
+  final DateTime selectedDate;
+  final void Function(DateTime) onDateSelected;
+
+  ProgressDetailSelectDateButton({
+    Key key,
+    @required this.leadingString,
+    @required this.selectedDate,
+    @required this.onDateSelected,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return FlatButton(
+      color: Colors.blue,
+      child: Text(
+          "$leadingString ${selectedDate.toLocal().toString().split(" ")[0]}"),
+      onPressed: () async {
+        DateTime picked = await showDatePicker(
+          context: context,
+          initialDate: selectedDate,
+          firstDate: DateTime(selectedDate.year - 5),
+          lastDate: DateTime(selectedDate.year + 5),
+        );
+        onDateSelected(picked);
+      },
+    );
+  }
+}