winforms qr code reader

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{ //if it exists if (SpendingList.Contains(sp)) { //replace it with the changed one SpendingList[SpendingList.IndexOf(sp)] = sp; } else { //add the new one SpendingList.Add(sp); } //handle property changed sp.PropertyChanged += new System.ComponentModel. PropertyChangedEventHandler(Spending_PropertyChanged); //force a recalc of the bars in the graph sp.ParentCollection = SpendingList; } } //item removed else if (Msg.MsgType == MessageType.ItemRemoved) { foreach (Spending sp in Msg.Items) { //unhook the event handler SpendingList[SpendingList.IndexOf(sp)].PropertyChanged -= Spending_PropertyChanged; //remove from data source SpendingList.Remove(sp); } //force a recalc of the bars in the graph if (SpendingList.Count > 0) SpendingList[0].ParentCollection = SpendingList; } }); //start listening for incoming messages GraphReceiver.Listen(); } void Spending_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { //send a message

GraphSender.SendAsync( Message.Serialize( new Message { //changed item Items = new List<Spending> { sender as Spending }, //message type - item value changed MsgType = MessageType.ItemsValueChanged })); } private void Rectangle_MouseMove(object sender, MouseEventArgs e) { if (MouseLeftBtnDown) { Rectangle rect = (Rectangle)sender; if (Dragging == false) { Dragging = true; rect.CaptureMouse(); } Point CurrentPos = e.GetPosition(sender as Rectangle); double Moved = CurrentPos.X - PreviousPos.X; if (rect.Width + Moved >= 0) { rect.Width += Moved; } PreviousPos = CurrentPos; } } private void Rectangle_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { MouseLeftBtnDown = true; PreviousPos = e.GetPosition(sender as Rectangle); } private void Rectangle_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { Rectangle rect = (Rectangle)sender; if (Dragging)

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{ Dragging = false; rectReleaseMouseCapture(); } MouseLeftBtnDown = false; } } } As before, this application needs to both send and receive messages As shown in Listing 7-34, you create instances of LocalMessageSender and LocalMessageReceiver such that this application can receive messages from the worksheet application and send messages to it as well In the constructor, after the datasource is bound, you handle the PropertyChanged event for each item in the collection The PropertyChanged event is raised whenever the user drags a bar within the graph; if you look at the handler for the PropertyChanged event, note that you send a message to the other application indicating thus action You also handle the MessageReceived event as before In the handler, you handle messages of both types where item values are changed and where items are removed.

is symmetric. Whenever you alter components running on the server, components on the client side are automatically updated in the browser by the ZK engine. Furthermore, the behavior of UI components is triggered by user activities or events sent from other components, which makes it easy to understand the operation of your web application.

a movement. When you buy an iPod, of course, you re supporting Gandhi against British Colonialism. Every MacBook you buy takes a stand against dictatorship and hunger! Anyway. Deep breath.... The real point of this section is to think of what your company stands for, how it s perceived, and how it could be perceived. Managing your corporate brand is just as important for recruiting as it is for marketing.

If an item value changes, you check to see if the item that changed already exists or was newly created in the worksheet application and does not exist in the datasource for this application If it is an existing item, you replace it with the changed item; if it is a new item, you add it to the collection You also attach a handler to the Spending item so that you can track changes to it in this application Finally, you set the SpendingParentCollection property to the datasource to which it was added to in which it was replaced If you look at the definition of the Spending type in Listing 7-32, you see that this forces a property-change notification for all the items in the datasource.

The bar graph displays the spending as percentages of the total, and this causes the bar graph s bar widths to be recalculated based on the new values If an item is removed, you first unattach the PropertyChanged event handler from the item that was removed and then remove it from the datasource collection When the removals are complete, you force a similar recalculation of the bar widths based on the new percentages The rest of the code handles mouse events to enable user adjustments of the bars and is covered in Recipe 4-4..

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