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This chapter showed the two classes of dialogs available in Qt applications: active or passive; intelligent or dumb. The list dialog contains a slot for each action that the user can perform. This is called an active or intelligent dialog. Any dialog requiring anything but the simplest possible input from the user is good to make active. Small active elements can make a dialog very much easier to use. The editing dialog does not contain any slots; it simply relies on the intelligence built into the widgets used and the accept and reject slots. This is enough for very simple dialogs, in which the user can fill out fields of different types. This is called a passive or dumb dialog. It is quite common to have a few passive dialogs in an application; in fact, the application does not work without them. Even though the editing dialog is passive toward the user, it does not have to be passive toward the developer you. The editing dialog nicely hides the actual implementation of the graphical user interface using the name and number properties. This made it possible to keep the ui variable private at the cost of a few lines of trivial code. By doing this, you ensure that the UI can be changed without changing the code using the editing dialog. Separating the UI and the code of the application usually helps when maintaining and extending the application in the future.

ll graphical user interfaces (UIs) are built around widgets that are arranged using layouts. In this chapter you will learn which widgets Qt provides and how they are used. You will also have a look at how layouts are used to create the desired design. The chapter alternates between using code directly and using Designer to visually build the user interface, which will teach you to understand the code that Designer generates.

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It will look like the following: Private Sub Code1_ExecuteCode(ByVal sender As SystemObject, ByVal e As SystemEventArgs) MsgBox("Code 1: Counter=" & IntCounter) End Sub This displays Code 1 and the number stored in the variable Run the workflow Because there s no UntilCondition on the CAG activity, all activities are only executed once View the code of the workflow and add a Code1WhileCondition with the following code, then set the Condition property of the Code1 activity to be this condition: Private Sub Code1WhileCondition(ByVal sender As SystemObject, ByVal e As ConditionalEventArgs) eResult = IntCounter <4 IntCounter = IntCounter+1 End Sub This condition, and setting the property, causes the Code1 activity to execute each time the CAG executes and the IntCounter value is less than 4 Run the workflow again Again, you get the same result: the Code1 message box only displays one time.

Returns an array of strings indicating the data bindings for this control. Gets the data context for the binding associated with the control. Returns the ID for the control. Allows the access key for quick access to this control to be set or read. Returns an object reference to the associated element. Returns an array of strings indicating the behaviors associated with this control. Gets or sets the cssClass for this control. You can also use the various CSS methods of the control to manipulate its CSS class. Gets or sets whether the control is enabled. When true, the control is enabled; when false, the control is grayed out. Returns an object containing the element s style settings. Gets or sets the value of the control in the tab index. Gets or sets the visibility of the control. If true, the control is visible; if false, it is invisible.

As you learned in the last chapter, a dialog is a top-level window, and all dialogs are built from widgets. Further, widgets are organized using layouts that make it possible to build flexible dialogs. Layouts help make Qt special. Using layouts makes it easy to build dialogs that adapt to changes in screen resolution, font sizes, and different languages. An alternative to using layouts is static placement, which ensures that all widgets are given a size and location. So if a translator wants to use texts of different lengths in different languages, the design of the dialog must be adapted to the longest text. Using layouts, the design describes the relative placement of the widgets instead of their absolute sizes and locations. The widgets then tell layouts how much space they need and are placed in the dialog accordingly. Let s start the exploration by using Designer. Start Designer and create a new dialog from the buttons at the bottom template. Then add a group box, a line edit, a label, and a vertical spacer to the dialog, as shown in Figure 3-1. Make sure that the line edit and the label are inside the group box. You can try to move the group box. If the other widgets are inside it, they should move with the group box.

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