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549 lines
16 KiB
549 lines
16 KiB
/************************************************************************
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Extended WPF Toolkit
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Copyright (C) 2010-2012 Xceed Software Inc.
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This program is provided to you under the terms of the Microsoft Public
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License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license
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This program can be provided to you by Xceed Software Inc. under a
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proprietary commercial license agreement for use in non-Open Source
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projects. The commercial version of Extended WPF Toolkit also includes
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priority technical support, commercial updates, and many additional
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useful WPF controls if you license Xceed Business Suite for WPF.
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Visit http://xceed.com and follow @datagrid on Twitter.
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**********************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Threading;
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using Xceed.Wpf.Toolkit.Core.Utilities;
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namespace Xceed.Wpf.Toolkit
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{
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[TemplatePart( Name = PART_CalculatorButtonPanel, Type = typeof( ContentControl ) )]
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public class Calculator : Control
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{
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private const string PART_CalculatorButtonPanel = "PART_CalculatorButtonPanel";
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#region Members
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private ContentControl _buttonPanel;
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private bool _showNewNumber = true;
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private decimal _previousValue;
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private Operation _lastOperation = Operation.None;
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private CalculatorButtonType _lastButtonPressed;
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private readonly Dictionary<Button, DispatcherTimer> _timers = new Dictionary<Button, DispatcherTimer>();
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#endregion //Members
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#region Enumerations
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public enum CalculatorButtonType
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{
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Add,
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Back,
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Cancel,
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Clear,
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Decimal,
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Divide,
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Eight,
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Equal,
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Five,
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Four,
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Fraction,
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MAdd,
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MC,
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MR,
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MS,
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MSub,
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Multiply,
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Negate,
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Nine,
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None,
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One,
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Percent,
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Seven,
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Six,
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Sqrt,
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Subtract,
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Three,
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Two,
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Zero
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}
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public enum Operation
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{
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Add,
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Subtract,
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Divide,
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Multiply,
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Percent,
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Sqrt,
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Fraction,
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None,
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Clear,
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Negate
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}
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#endregion //Enumerations
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#region Properties
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#region CalculatorButtonType
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public static readonly DependencyProperty CalculatorButtonTypeProperty = DependencyProperty.RegisterAttached( "CalculatorButtonType", typeof( CalculatorButtonType ), typeof( Calculator ), new UIPropertyMetadata( CalculatorButtonType.None, OnCalculatorButtonTypeChanged ) );
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public static CalculatorButtonType GetCalculatorButtonType( DependencyObject target )
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{
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return ( CalculatorButtonType )target.GetValue( CalculatorButtonTypeProperty );
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}
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public static void SetCalculatorButtonType( DependencyObject target, CalculatorButtonType value )
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{
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target.SetValue( CalculatorButtonTypeProperty, value );
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}
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private static void OnCalculatorButtonTypeChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
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{
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OnCalculatorButtonTypeChanged( o, ( CalculatorButtonType )e.OldValue, ( CalculatorButtonType )e.NewValue );
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}
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private static void OnCalculatorButtonTypeChanged( DependencyObject o, CalculatorButtonType oldValue, CalculatorButtonType newValue )
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{
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Button button = o as Button;
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button.CommandParameter = newValue;
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button.Content = CalculatorUtilities.GetCalculatorButtonContent( newValue );
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}
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#endregion //CalculatorButtonType
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#region DisplayText
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public static readonly DependencyProperty DisplayTextProperty = DependencyProperty.Register( "DisplayText", typeof( string ), typeof( Calculator ), new UIPropertyMetadata( "0", OnDisplayTextChanged ) );
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public string DisplayText
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{
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get
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{
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return ( string )GetValue( DisplayTextProperty );
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}
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set
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{
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SetValue( DisplayTextProperty, value );
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}
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}
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private static void OnDisplayTextChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
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{
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Calculator calculator = o as Calculator;
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if( calculator != null )
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calculator.OnDisplayTextChanged( ( string )e.OldValue, ( string )e.NewValue );
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}
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protected virtual void OnDisplayTextChanged( string oldValue, string newValue )
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{
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// TODO: Add your property changed side-effects. Descendants can override as well.
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}
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#endregion //DisplayText
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#region Memory
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public static readonly DependencyProperty MemoryProperty = DependencyProperty.Register( "Memory", typeof( decimal ), typeof( Calculator ), new UIPropertyMetadata( default( decimal ) ) );
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public decimal Memory
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{
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get
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{
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return ( decimal )GetValue( MemoryProperty );
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}
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set
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{
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SetValue( MemoryProperty, value );
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}
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}
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#endregion //Memory
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#region Precision
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public static readonly DependencyProperty PrecisionProperty = DependencyProperty.Register( "Precision", typeof( int ), typeof( Calculator ), new UIPropertyMetadata( 6 ) );
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public int Precision
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{
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get
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{
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return ( int )GetValue( PrecisionProperty );
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}
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set
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{
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SetValue( PrecisionProperty, value );
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}
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}
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#endregion //Precision
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#region Value
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public static readonly DependencyProperty ValueProperty = DependencyProperty.Register( "Value", typeof( decimal? ), typeof( Calculator ), new FrameworkPropertyMetadata( default( decimal ), FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnValueChanged ) );
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public decimal? Value
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{
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get
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{
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return ( decimal? )GetValue( ValueProperty );
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}
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set
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{
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SetValue( ValueProperty, value );
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}
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}
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private static void OnValueChanged( DependencyObject o, DependencyPropertyChangedEventArgs e )
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{
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Calculator calculator = o as Calculator;
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if( calculator != null )
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calculator.OnValueChanged( ( decimal? )e.OldValue, ( decimal? )e.NewValue );
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}
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protected virtual void OnValueChanged( decimal? oldValue, decimal? newValue )
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{
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SetDisplayText( newValue );
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RoutedPropertyChangedEventArgs<object> args = new RoutedPropertyChangedEventArgs<object>( oldValue, newValue );
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args.RoutedEvent = ValueChangedEvent;
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RaiseEvent( args );
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}
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#endregion //Value
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#endregion //Properties
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#region Constructors
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static Calculator()
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{
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DefaultStyleKeyProperty.OverrideMetadata( typeof( Calculator ), new FrameworkPropertyMetadata( typeof( Calculator ) ) );
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}
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public Calculator()
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{
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CommandBindings.Add( new CommandBinding( CalculatorCommands.CalculatorButtonClick, ExecuteCalculatorButtonClick ) );
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AddHandler( MouseDownEvent, new MouseButtonEventHandler( Calculator_OnMouseDown ), true );
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}
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#endregion //Constructors
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#region Base Class Overrides
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public override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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_buttonPanel = GetTemplateChild( PART_CalculatorButtonPanel ) as ContentControl;
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}
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protected override void OnTextInput( TextCompositionEventArgs e )
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{
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var buttonType = CalculatorUtilities.GetCalculatorButtonTypeFromText( e.Text );
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if( buttonType != CalculatorButtonType.None )
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{
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SimulateCalculatorButtonClick( buttonType );
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ProcessCalculatorButton( buttonType );
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}
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}
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#endregion //Base Class Overrides
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#region Event Handlers
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private void Calculator_OnMouseDown( object sender, MouseButtonEventArgs e )
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{
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if( !IsFocused )
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{
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Focus();
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e.Handled = true;
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}
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}
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void Timer_Tick( object sender, EventArgs e )
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{
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DispatcherTimer timer = ( DispatcherTimer )sender;
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timer.Stop();
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timer.Tick -= Timer_Tick;
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if( _timers.ContainsValue( timer ) )
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{
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var button = _timers.Where( x => x.Value == timer ).Select( x => x.Key ).FirstOrDefault();
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if( button != null )
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{
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VisualStateManager.GoToState( button, button.IsMouseOver ? "MouseOver" : "Normal", true );
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_timers.Remove( button );
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}
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}
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}
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#endregion //Event Handlers
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#region Methods
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private void Calculate()
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{
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if( _lastOperation == Operation.None )
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return;
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try
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{
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Value = Decimal.Round( CalculateValue( _lastOperation ), Precision );
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SetDisplayText( Value ); //Set DisplayText even when Value doesn't change
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}
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catch
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{
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Value = null;
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DisplayText = "ERROR";
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}
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}
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private void SetDisplayText( decimal? newValue )
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{
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if( newValue.HasValue && ( newValue.Value != 0 ) )
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DisplayText = newValue.ToString();
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else
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DisplayText = "0";
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}
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private void Calculate( Operation newOperation )
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{
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if( !_showNewNumber )
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Calculate();
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_lastOperation = newOperation;
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}
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private void Calculate( Operation currentOperation, Operation newOperation )
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{
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_lastOperation = currentOperation;
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Calculate();
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_lastOperation = newOperation;
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}
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private decimal CalculateValue( Operation operation )
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{
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decimal newValue = decimal.Zero;
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decimal currentValue = CalculatorUtilities.ParseDecimal( DisplayText );
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switch( operation )
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{
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case Operation.Add:
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newValue = CalculatorUtilities.Add( _previousValue, currentValue );
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break;
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case Operation.Subtract:
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newValue = CalculatorUtilities.Subtract( _previousValue, currentValue );
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break;
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case Operation.Multiply:
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newValue = CalculatorUtilities.Multiply( _previousValue, currentValue );
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break;
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case Operation.Divide:
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newValue = CalculatorUtilities.Divide( _previousValue, currentValue );
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break;
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//case Operation.Percent:
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// newValue = CalculatorUtilities.Percent(_previousValue, currentValue);
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// break;
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case Operation.Sqrt:
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newValue = CalculatorUtilities.SquareRoot( currentValue );
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break;
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case Operation.Fraction:
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newValue = CalculatorUtilities.Fraction( currentValue );
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break;
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case Operation.Negate:
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newValue = CalculatorUtilities.Negate( currentValue );
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break;
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default:
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newValue = decimal.Zero;
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break;
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}
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return newValue;
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}
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void ProcessBackKey()
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{
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string displayText;
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if( DisplayText.Length > 1 && !( DisplayText.Length == 2 && DisplayText[ 0 ] == '-' ) )
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{
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displayText = DisplayText.Remove( DisplayText.Length - 1, 1 );
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}
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else
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{
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displayText = "0";
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_showNewNumber = true;
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}
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DisplayText = displayText;
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}
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private void ProcessCalculatorButton( CalculatorButtonType buttonType )
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{
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if( CalculatorUtilities.IsDigit( buttonType ) )
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ProcessDigitKey( buttonType );
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else if( ( CalculatorUtilities.IsMemory( buttonType ) ) )
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ProcessMemoryKey( buttonType );
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else
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ProcessOperationKey( buttonType );
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_lastButtonPressed = buttonType;
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}
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private void ProcessDigitKey( CalculatorButtonType buttonType )
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{
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if( _showNewNumber )
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DisplayText = CalculatorUtilities.GetCalculatorButtonContent( buttonType );
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else
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DisplayText += CalculatorUtilities.GetCalculatorButtonContent( buttonType );
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_showNewNumber = false;
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}
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private void ProcessMemoryKey( Calculator.CalculatorButtonType buttonType )
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{
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decimal currentValue = CalculatorUtilities.ParseDecimal( DisplayText );
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switch( buttonType )
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{
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case Calculator.CalculatorButtonType.MAdd:
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Memory += currentValue;
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break;
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case Calculator.CalculatorButtonType.MC:
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Memory = decimal.Zero;
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break;
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case Calculator.CalculatorButtonType.MR:
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DisplayText = Memory.ToString();
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break;
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case Calculator.CalculatorButtonType.MS:
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Memory = currentValue;
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break;
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case Calculator.CalculatorButtonType.MSub:
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Memory -= currentValue;
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break;
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default:
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break;
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}
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_showNewNumber = true;
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}
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private void ProcessOperationKey( CalculatorButtonType buttonType )
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{
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switch( buttonType )
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{
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case CalculatorButtonType.Add:
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Calculate( Operation.Add );
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break;
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case CalculatorButtonType.Subtract:
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Calculate( Operation.Subtract );
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break;
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case CalculatorButtonType.Multiply:
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Calculate( Operation.Multiply );
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break;
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case CalculatorButtonType.Divide:
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Calculate( Operation.Divide );
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break;
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case CalculatorButtonType.Percent:
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if( _lastOperation != Operation.None )
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{
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decimal currentValue = CalculatorUtilities.ParseDecimal( DisplayText );
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decimal newValue = CalculatorUtilities.Percent( _previousValue, currentValue );
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DisplayText = newValue.ToString();
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}
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else
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{
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DisplayText = "0";
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_showNewNumber = true;
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}
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return;
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case CalculatorButtonType.Sqrt:
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Calculate( Operation.Sqrt, Operation.None );
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break;
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case CalculatorButtonType.Fraction:
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Calculate( Operation.Fraction, Operation.None );
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break;
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case CalculatorButtonType.Negate:
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Calculate( Operation.Negate, Operation.None );
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break;
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case CalculatorButtonType.Equal:
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Calculate( Operation.None );
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break;
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case CalculatorButtonType.Clear:
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Calculate( Operation.Clear, Operation.None );
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break;
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case CalculatorButtonType.Cancel:
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DisplayText = _previousValue.ToString();
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_lastOperation = Operation.None;
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_showNewNumber = true;
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return;
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case CalculatorButtonType.Back:
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ProcessBackKey();
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return;
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default:
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break;
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}
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Decimal.TryParse( DisplayText, out _previousValue );
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_showNewNumber = true;
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}
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private void SimulateCalculatorButtonClick( CalculatorButtonType buttonType )
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{
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var button = CalculatorUtilities.FindButtonByCalculatorButtonType( _buttonPanel, buttonType );
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if( button != null )
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{
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VisualStateManager.GoToState( button, "Pressed", true );
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DispatcherTimer timer;
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if( _timers.ContainsKey( button ) )
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{
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timer = _timers[ button ];
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timer.Stop();
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}
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else
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{
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timer = new DispatcherTimer();
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timer.Interval = TimeSpan.FromMilliseconds( 100 );
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timer.Tick += Timer_Tick;
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_timers.Add( button, timer );
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}
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timer.Start();
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}
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}
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#endregion //Methods
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#region Events
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//Due to a bug in Visual Studio, you cannot create event handlers for nullable args in XAML, so I have to use object instead.
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public static readonly RoutedEvent ValueChangedEvent = EventManager.RegisterRoutedEvent( "ValueChanged", RoutingStrategy.Bubble, typeof( RoutedPropertyChangedEventHandler<object> ), typeof( Calculator ) );
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public event RoutedPropertyChangedEventHandler<object> ValueChanged
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{
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add
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{
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AddHandler( ValueChangedEvent, value );
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}
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remove
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{
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RemoveHandler( ValueChangedEvent, value );
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}
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}
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#endregion //Events
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#region Commands
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private void ExecuteCalculatorButtonClick( object sender, ExecutedRoutedEventArgs e )
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{
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var buttonType = ( CalculatorButtonType )e.Parameter;
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ProcessCalculatorButton( buttonType );
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}
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#endregion //Commands
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}
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}
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