The Ring programming language version 1.9 book - Part 82 of 210
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The document discusses the Objects Library in RingQt, which provides a more natural API for managing GUI objects and connecting events compared to using global variables. It allows opening multiple windows from the same class, setting event methods, and accessing parent/child windows easily. The library uses the MVC pattern. Examples are provided to demonstrate creating main and sub windows, and opening windows from different classes while linking them to call methods between windows. The Form Designer tool is also covered, including its interface, running generated code, and writing event handler methods.
![Ring Documentation, Release 1.9
In the next code for example (from FirstWindowController.ring)
The Open_WindowAndLink() will create an object from the SecondWindowController Class
Then will add the Method : SecondWindow(), IsSecondWindow() Methods to the FirstWindowController Class
Also will add the Method : FirstWindow(), IsFirstWindow() Methods to the SecondWindowController Class
So the SendMessage() method in FirstWindowController class can use the SecondWindow() method to access the
object.
This is more simple than using Last_Window(), Parent() and SetParentObject() methods.
class firstwindowController from windowsControllerParent
oView = new firstwindowView
func OpenSecondWindow
Open_WindowAndLink(:SecondWindowController,self)
func SendMessage
if IsSecondWindow()
SecondWindow().setMessage("Message from the first window")
ok
func setMessage cMessage
oView.Label1.setText(cMessage)
66.4 Open_WindowInPackages() Function
The Open_WindowInPackages() function is the same as Open_Window() but takes an extra list that determine the
packages to import before opening the window.
Syntax:
Open_WindowInPackages(cClassName,aPackagesList)
Example:
The next example from the Form Designer source code, Open the Window Flags window using the
open_windowInPackages() function.
We determine the class name “WindowFlagsController” and the packages name.
The Window Flags window uses the FormDesigner and System.GUI packages.
open_windowInPackages(:WindowFlagsController,[
"formdesigner",
"System.GUI"
])
66.5 Objects Library Source Code
The library source code is very simple, You can check the source code files
• https://github.com/ring-lang/ring/blob/master/extensions/ringqt/objectslib/objects.ring
• https://github.com/ring-lang/ring/blob/master/extensions/ringqt/objectslib/subwindows.ring
66.4. Open_WindowInPackages() Function 783](https://image.slidesharecdn.com/811ring-181111125710/85/The-Ring-programming-language-version-1-9-book-Part-82-of-210-5-320.jpg)
The Ring programming language version 1.9 book - Part 82 of 210
- 1. CHAPTER SIXTYSIX OBJECTS LIBRARY FOR RINGQT APPLICATION In this chapter we will learn about the objects library for RingQt applications. Ring comes with the Objects library for RingQt applications. Instead of using global variables for windows objects and connecting events to objects using the object name, the Objects Library will manage the GUI objects and will provide a more natural API to quickly create one or many windows from the same class and the library provide a way to quickly set methods to be executed when an event is fired. Also the library provide a natural interface to quickly use the parent or the caller windows from the child or sub windows. The Objects Library is designed to be used with the MVC Design Pattern. The Objects Library is merged in RingQt so you can use it directly when you use RingQt 66.1 Library Usage • Use the Open_Window(cWindowControllerClassName) function to open new Windows • Create at least Two Classes for each window, The Controller Class and the View Class • Create each controller class from the WindowsControllerParent Class • Create each view class from the WindowsViewParent Class • Use the Last_Window() function to get the object of the last window created (The Controller object). • When you call a sub window, use the SetParentObject() method and pass the self object. • In the View Class, To determine the event method use the Method(cMethodName) function. • The Method(cMethodName) function determine the method in the controller class that will be executed. • Each controller class contains by default the CloseAction() method that you can call to close the window. • You don’t need to call the Show() Method for each window, When you use Open_Window() It will be called. • In the view class, Define the GUI window object as an attribute called win. • You can use Open_WindowNoShow() to avoid displaying the window. • You can use Open_WindowAndLink() to quickly get methods to access the windows. 66.2 Example In the next example we will create two types of windows. • Main Window contains a button. When the user click on the button a sub window will be opened. 779
- 2. Ring Documentation, Release 1.9 • The User Can click on the button many times to open many sub windows. • Each Sub Window contains Two buttons. • The first button in the sub window change the Main and the Sub Windows Titles. • The second button in the sub window close the Sub Window. load "guilib.ring" new qApp { open_window( :MainWindowController ) exec() } class MainWindowController from WindowsControllerParent oView = new MainWindowView func SubWindowAction Open_window( :SubWindowController ) Last_Window().SetParentObject(self) class MainWindowView from WindowsViewParent win = new qWidget() { SetWindowTitle("Main Window") btnSub = new qPushButton(win) { setText("Sub Window") setClickEvent( Method( :SubWindowAction ) ) } resize(400,400) } class SubWindowController from WindowsControllerParent oView = new SubWindowView func SetMainWindowTitleAction Parent().oView.win.SetWindowTitle("Message from the Sub Window") oView.win.SetWindowTitle("Click Event Done!") class SubWindowView from WindowsViewParent win = new qWidget() { SetWindowTitle("Sub Window") btnMsg = new qPushButton(win) { setText("Set Main Window Title") setClickEvent( Method( :SetMainWindowTitleAction ) ) } btnClose = new qPushButton(win) { Move(200,0) setText("Close") setClickEvent( Method( :CloseAction ) ) } resize(400,400) } The next screen shot after creating three sub windows. 66.2. Example 780
- 3. Ring Documentation, Release 1.9 The next screen shot after clicking on the button in each sub window. 66.2. Example 781
- 4. Ring Documentation, Release 1.9 66.3 Open_WindowAndLink() Function We can use the Open_WindowAndLink() function to connect between the application windows, pass messages (call methods) between the objects. This function uses Meta-programming to define dynamic methods in the Caller Class to use the dynamic objects of other windows that we create. Example : (Uses the Form Designer) First Window 1. https://github.com/ring-lang/ring/blob/master/applications/formdesigner/tests/twowindowspart5/firstwindowView.ring 2. https://github.com/ring-lang/ring/blob/master/applications/formdesigner/tests/twowindowspart5/firstwindowController.ring Second Window 1. https://github.com/ring-lang/ring/blob/master/applications/formdesigner/tests/twowindowspart5/secondwindowView.ring 2. https://github.com/ring-lang/ring/blob/master/applications/formdesigner/tests/twowindowspart5/secondwindowController.ring 66.3. Open_WindowAndLink() Function 782
- 5. Ring Documentation, Release 1.9 In the next code for example (from FirstWindowController.ring) The Open_WindowAndLink() will create an object from the SecondWindowController Class Then will add the Method : SecondWindow(), IsSecondWindow() Methods to the FirstWindowController Class Also will add the Method : FirstWindow(), IsFirstWindow() Methods to the SecondWindowController Class So the SendMessage() method in FirstWindowController class can use the SecondWindow() method to access the object. This is more simple than using Last_Window(), Parent() and SetParentObject() methods. class firstwindowController from windowsControllerParent oView = new firstwindowView func OpenSecondWindow Open_WindowAndLink(:SecondWindowController,self) func SendMessage if IsSecondWindow() SecondWindow().setMessage("Message from the first window") ok func setMessage cMessage oView.Label1.setText(cMessage) 66.4 Open_WindowInPackages() Function The Open_WindowInPackages() function is the same as Open_Window() but takes an extra list that determine the packages to import before opening the window. Syntax: Open_WindowInPackages(cClassName,aPackagesList) Example: The next example from the Form Designer source code, Open the Window Flags window using the open_windowInPackages() function. We determine the class name “WindowFlagsController” and the packages name. The Window Flags window uses the FormDesigner and System.GUI packages. open_windowInPackages(:WindowFlagsController,[ "formdesigner", "System.GUI" ]) 66.5 Objects Library Source Code The library source code is very simple, You can check the source code files • https://github.com/ring-lang/ring/blob/master/extensions/ringqt/objectslib/objects.ring • https://github.com/ring-lang/ring/blob/master/extensions/ringqt/objectslib/subwindows.ring 66.4. Open_WindowInPackages() Function 783
- 6. CHAPTER SIXTYSEVEN USING THE FORM DESIGNER In this chapter we will learn about using the Form Designer. We can run the From Designer from Ring Notepad From the Menubar in Ring Notepad - View Menu - We can Show/Hide the Form Designer window. Also we can run the Form Designer in another window. From the Ring Notepad - Tools Menu - Select the Form Designer. 784
- 7. Ring Documentation, Release 1.9 67.1 The Designer Windows • Toolbox : To select controls to be added to the window. • Properties : To set the properties of the active window or controls. • Design Region : To select, move and resize the window and the controls. 67.2 The Toolbox We have many buttons. • Lock : We can use it to draw many controls of the same type quickly. • Select : We can use it to select a control in the Design Region • Controls Buttons : Select a control to be added to the window. 67.3 The Properties • When we select the window or one control, We will have the selected object properties. • Also In the properties window we have a combobox to select the active control. • Some properties provide a button next to the property value. We can click on the button to get more options. • When we select more than one control, We will have options for multi-selection 67.1. The Designer Windows 785
- 8. Ring Documentation, Release 1.9 67.4 Running Forms When we save the form file (*.rform), The Form Designer will create two Ring files • The Controller Class • The View Class For example, if the form file is helloworld.rform The form designer will generate two files • helloworldcontroller.ring • helloworldview.ring To run the program, Open the controller class file then click the Run button (CTRL+F5) Tip: When you open a form using Ring Notepad, the controller class will be opened automatically, So we can press (CTRL+F5) or click on the Run button while the form designer window is active. 67.5 Events Code 1. Just type the method name in the event property. 67.4. Running Forms 786
- 9. Ring Documentation, Release 1.9 (2) Then write the method code in the controller class. 67.5. Events Code 787
- 10. Ring Documentation, Release 1.9 In this example we write func CloseWindow oView.win.close() Where inside the controller class, We uses the oView object to access the form. Another Example : 67.5. Events Code 788