Newer
Older
configurations as you need.
To delete the build configuration currently selected, click \gui Remove.

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\section1 Editing Build Configurations
To edit a build configuration:
\list 1
\o Select the build configuration you want to edit in
\gui{Edit Build Configuration}.
\o In section \gui General, you can specify:
\o The \l{glossary-project-qt}{Qt version} you want to use to
build your project. For more information, see
\l{Selecting the Qt version}.
\o The tool chain required to build the project.

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\o By default, projects are built in a separate directory
from the source directory, as \l{glossary-shadow-build}{shadow builds}.
This keeps the files generated for each target platform separate.
\note Shadow building is not supported by the Symbian build system.
Also, shadow building on Windows is not supported for Maemo.
If you only build for one target platform, you can deselect
the \gui{Shadow Build} checkbox.
\endlist

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\section1 Build Steps
The build system of Qt Creator is built on qmake and make. In
\gui{Build Steps} you can change the settings for qmake and make. Qt
Creator runs the make command using the Qt version defined for the current
build configuration.

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\image qtcreator-build-steps.png "Build steps"
\section1 Clean Steps
You can use the cleaning process to remove intermediate files. This process
might help you to fix obscure issues during the process of building a
project.

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\image qtcreator-clean-steps.png "Clean steps"
You can define the cleaning steps for your builds in the \gui{Clean Steps}:
\list
\o To add a clean step using make or a custom process, click
\gui{Add clean step} and select the type of step you want to add.
By default, custom steps are disabled. Activate custom steps by

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checking the \gui{Enable custom process step} check-box.
\o To remove a clean step, click \gui{Remove Item}.
\o To change the order of steps, click
\inlineimage qtcreator-movestep.png
.
\endlist

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\section1 Build Environment
You can specify the environment you want to use for building in the
\bold{Build Environment} section. By default, the environment in which Qt
Creator was started is used and modified to include the Qt version.
Depending on the selected Qt version, Qt Creator automatically sets the
necessary environment variables. You can edit existing environment
variables or add, reset and unset new variables based on your project
requirements.

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*/
/*!
\contentspage index.html
\previouspage creator-build-settings.html
\page creator-run-settings.html
\nextpage creator-editor-settings.html
\title Specifying Run Settings
Qt Creator automatically creates run configurations for your project.

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To view and modify the settings, select \gui {Projects > Run}.
The settings to specify depend on the type of the project: qmake project
or Qt Quick project.
\section1 Specifying Run Settings for qmake Projects
The run configurations for qmake projects derive their executable from the parsed .pro
files. You can also create custom executable run configurations where you
can set the executable to be run.

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\section1 Specifying Run Settings for Qt Quick Projects
To run Qt Quick projects in the QML viewer, specify the connection to the
\gui {QML Runtime} in the \gui {Run configuration} field. The settings
are specified automatically and, usually, you do not need to change them:
\list
\o \gui {QML runtime} is the path to QML viewer executable.
\o \gui {QML runtime arguments} sets arguments for running the QML viewer.
The \c{-I <directory>} argument searches for C++ or QML plugins from
the project folder. For a list of available arguments, enter \c {qml --help}
on the command line.
\o \gui {Main QML File} is the Qt Quick project file.
\o \gui {Debugging address} is the IP address to access the QML viewer.
\o \gui {Debugging port} is the port to access the QML viewer. You can use any
free port in the registered port range.
\endlist
\image qmldesigner-run-settings.png "Run settings for Qt Quick projects"
To set the executable to run, select \gui {Custom Executable} in the
\gui {Run configuration} field.
\image qmldesigner-run-custom-exe.png "Run settings for custom executables"
*/

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/*!
\contentspage index.html
\previouspage creator-run-settings.html
\page creator-editor-settings.html
\nextpage creator-build-dependencies.html
\title Specifying Editor Settings
To define the default file encoding, select the desired encoding in \gui Projects >
\gui{Editor Settings}. By default, the Qt Creator uses the file encoding
used by your system.

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\image qtcreator-editor-settings.png "Editor Settings view"
*/

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/*!
\contentspage index.html
\previouspage creator-editor-settings.html
\page creator-build-dependencies.html
\nextpage creator-project-managing-sessions.html
\title Specifying Dependencies
If you have multiple projects loaded in your session, you can define the
dependencies between them. Inter-project dependencies affect the build
order of your projects.
\note Inter-project dependencies are unrelated inside a qmake

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\image qtcreator-build-dependencies.png "Dependencies view"

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To define the dependencies between projects:
\list 1

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\o In \gui Projects, select a project.
\o Click \gui Dependencies.
\o Select projects as dependencies.

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\page creator-getting-started.html
\nextpage creator-writing-program.html
\title Getting Started
This section contains examples that illustrate how to use Qt Creator and the
integrated design tools, \QD and \QMLD, to create simple applications:
\list

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\o \l{Creating a Qt C++ Application}
\o \l{Creating a Qt Quick Application}

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\endlist
*/
/*!
\contentspage index.html
\previouspage creator-writing-program.html
\page creator-qml-application.html

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\title Creating a Qt Quick Application

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\note This tutorial assumes that you are familiar with the \l {http://qt.nokia.com/doc/4.7-snapshot/declarativeui.html}
{QML declarative language}.

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This tutorial describes how to use Qt Creator to create a small animated

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Qt Quick application, Hello World.

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\image qmldesigner-helloworld.png "Hello World"
\section1 Creating the Hello World Project
\note Create the project with the \gui{Help} mode active so that you can follow
these instructions while you work.
\list 1

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\o Select \gui{File > New File or Project > Qt Quick Project > Qt QML Application > OK}.

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\image qmldesigner-new-project.png "New File or Project dialog"
The \gui{Introduction and Project Location} dialog opens.
\image qmldesigner-new-project-location.png "Introduction and Project Location dialog"
\o In the \gui{Name} field, type \bold {Hello World}.
\o In the \gui {Create in} field, enter the path for the project files. For example,
\c {C:\Qt\examples}, and then click \gui{Next}.
The \gui{Project Management} dialog opens.
\image qmldesigner-new-project-summary.png "Project Management dialog"
\o Review the project settings, and click \gui{Finish} to create the project.
\endlist
The HelloWorld project now contains the following files:
\list
\o HelloWorld.qmlproject
\o HelloWorld.qml
\endlist
\image qmldesigner-new-project-contents.png "HelloWorld project contents"
The .qmlproject file defines that all QML, JavaScript, and image files in
the project folder belong to the project. The .qml file contains some example
code that specifies the screen size (200x200) and a label that contains
the text \bold {Hello World}.
\section1 Designing the User Interface
\list 1

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\o In the \gui{Edit} mode, double-click the HelloWorld.qml file in
the \gui{Projects} pane to open it in the code editor.

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\o To set the screen size to that of some Symbian devices in portrait

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mode, for example, change the \c width to \bold 240 and \c height to \bold 320.

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\image qmldesigner-helloworld-screen-size.png "Setting the screen size"
\o Click \gui{Design} to design the UI in the visual editor.

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\note The visual \QMLD editor is provided as an experimental plugin that you must
enable to be able to edit QML files in the \gui Design mode. Enabling the
visual editor can negatively affect the overall stability of Qt Creator.
\o Restart Qt Creator to enable the visual editor.

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\o Drag and drop a \gui {Rectangle} from the \gui {Library} pane to the
scene.

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\image qmldesigner-helloworld-widget-add.png "Add component to Hello World"

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\o Edit the \gui {Properties} of the component to turn it into a red ball:

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\list a

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\o In the \gui {Colors} section, click the color picker to select a red

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color.
\o In the \gui {Radius} field, use the slider to set the radius value
to \bold 50.

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\image qmldesigner-helloworld-widget-edit.png "Edit the component"

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\endlist
\o To create a blue ball, press \key {Ctrl+C} and \key {Ctrl+V} to copy
and paste the red one, and then change its color to blue.
\image qmldesigner-helloworld-base-state.png "Hello World first view"
The first view of your application is now ready.
\note You can use graphical design tools to create nice images and
copy them to the projects folder to display them in the \gui {Library}
pane in \gui {Resources}.
\o In the \gui State pane, click the plus sign to add another view, or \e state
to the application.
\o Modify the state by dragging and dropping the widgets to switch their
places.
\image qmldesigner-helloworld-state1.png "Hello World second view"
\endlist
\section1 Animating the Scene
Animate the scene so that the widgets appear to switch places
on the screen.
\list 1
\o Click \gui {Edit} to open HelloWorld.qml in the code editor.
\o Add the following code to create a transition:
\code
transitions: [
Transition {
NumberAnimation { properties: "x, y"; duration: 500 }
}
\endcode
\note The code editor completes the code for you as you type.
\o Click the \inlineimage qtcreator-run.png
button to check that the application can be built and run.
\endlist
\section1 Adding Interaction
Add interaction to the scene to allow users to click on the screen to start
the animation.
\list 1
\o Click \gui{Design} to open HelloWorld.qml in the visual editor.
\o Drag and drop a \gui {Mouse Area} from the \gui {Library} to the scene.
\o In the \gui {Properties} pane, \gui {Geometry} tab, click the

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\inlineimage qmldesigner-anchor-fill-screen.png
button to make the mouse region cover the whole screen.
\o In the code editor, use data binding to add a \c when statement to
the states sections, as illustrated by the following code:
\code
states: [
State {
name: "State1"
when: mousearea1.pressed
\endcode
\endlist

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\section1 Building and Running the Application

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\list 1
\o Press \key {Ctrl+R} to build and run the application.
\o Click the screen and keep the mouse button pressed down to run the
animation.
\endlist

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\note In the \gui {QML Viewer}, select \gui {Skin} and select a mobile device
type to view the application as on a mobile device.

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*/
/*!
\contentspage index.html
\previouspage creator-getting-started.html
\page creator-writing-program.html
\nextpage creator-qml-application.html

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\title Creating a Qt C++ Application
\note This tutorial assumes that you have experience in writing basic Qt

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applications, using \QD to design user interfaces and using the Qt

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This tutorial describes how to use Qt Creator
to create a small Qt application, Text Finder. It is a simplified version of the
QtUiTools \l{http://doc.trolltech.com/uitools-textfinder.html}{Text Finder}
example.
\image qtcreator-textfinder-screenshot.png
\section1 Setting Up Your Environment

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Qt Creator automatically detects whether the location of Qt is in your \c PATH variable.
If you have installed several Qt versions, follow the
instructions in \l{Selecting the Qt version} to set the Qt path.

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\section1 Creating the Text Finder Project

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\note Create the project with the \gui{Help} mode active so that you can follow
these instructions while you work.

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\list 1
\o Select \gui{File > New File or Project > Qt Application Project > Qt Gui
Application > OK}.

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\image qtcreator-new-project.png "New File or Project dialog"

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The \gui{Introduction and Project Location} dialog opens.

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\image qtcreator-intro-and-location.png "Introduction and Project Location dialog"

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\o In the \gui{Name} field, type \bold {TextFinder}.
\o In the \gui {Create in} field, enter the path for the project files. For example,
\c {C:\Qt\examples}, and then click \gui{Next}.

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The \gui{Select Required Qt Versions} dialog opens.
\image qtcreator-new-project-qt-versions.png "Select Required Qt Versions dialog"

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\o Click \gui{Next} to use the Qt version set in the path in your project.

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The \gui{Class Information} dialog opens.

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\image qtcreator-class-info.png "Class Information dialog"

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\o In the \gui{Class Name} field, type \bold {TextFinder} as the class name.

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\o In the \gui{Base Class} list, select \bold {QWidget} as the base class type.

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\note The \gui{Header File}, \gui{Source File} and
\gui{Form File} fields are automatically updated to match the name of the
class.

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\o Click \gui{Next}.

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The \gui{Project Management} dialog opens.

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\image qtcreator-new-project-summary.png "Project Management dialog"

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\o Review the project settings, and click \gui{Finish} to create the project.

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\endlist

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The TextFinder project now contains the following files:

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\o textfinder.h
\o textfinder.cpp
\o main.cpp
\o textfinder.ui
\o textfinder.pro

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\image qtcreator-textfinder-contents.png "TextFinder project contents"

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The .h and .cpp files come with the necessary boiler plate code.
The .pro file is complete.

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Begin by designing the user interface and then move on to filling
in the missing code. Finally, add the find functionality.

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\section2 Designing the User Interface

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\image qtcreator-textfinder-ui.png "Text Finder UI"

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\list 1

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\o In the \gui{Editor} mode, double-click the textfinder.ui file in the \gui{Projects}
view to launch the integrated \QD.

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\o Drag and drop the following widgets to the form:

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\o \gui{Label} (\l{http://doc.trolltech.com/qlabel.html}{QLabel})
\o \gui{Line Edit} (\l{http://doc.trolltech.com/qlineedit.html}{QLineEdit})
\o \gui{Push Button} (\l{http://doc.trolltech.com/qpushbutton.html}{QPushButton})

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\image qtcreator-textfinder-ui-widgets.png "Adding widgets to Text Finder UI"

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\o Double-click the \gui{Label} widget and enter the text \bold{Keyword}.
\o Double-click the \gui{Push Button} widget and enter the text \bold{Find}.

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\o In the \gui Properties pane, change the \gui objectName to \bold findButton.
\image qtcreator-textfinder-objectname.png "Changing object names"

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\o Press \key {Ctrl+A} to select the widgets and click \gui{Lay out Horizontally}
(or press \gui{Ctrl+H}) to apply a horizontal layout
(\l{http://doc.trolltech.com/qhboxlayout.html}{QHBoxLayout}).
\image qtcreator-texfinder-ui-horizontal-layout.png "Applying horizontal layout"

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\o Drag and drop a \gui{Text Edit} widget (\l{http://doc.trolltech.com/qtextedit.html}{QTextEdit})
to the form.

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\o Select the screen area and click \gui{Lay out Vertically} (or press \gui{Ctr+V})
to apply a vertical layout (\l{http://doc.trolltech.com/qvboxlayout.html}{QVBoxLayout}).
\image qtcreator-textfinder-ui.png "Text Finder UI"

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Applying the horizontal and vertical layouts ensures that the application UI scales to different
screen sizes.
\o To call a find function when users press the \gui Find button, you use the Qt signals
and slots mechanism. A signal is emitted when a particular event occurs and a slot is
a function that is called in response to a particular signal. Qt widgets have predefined
signals and slots that you can use directly from \QD. To add a slot for the find function:
\list
\o Right-click the \gui Find button to open a context-menu.
\o Select \gui {Go to Slot > clicked()}, and then select \gui OK.
A private slot, \c{on_findButton_clicked()}, is added to the header file,
textfinder.h and a private function, \c{TextFinder::on_findButton_clicked()},
is added to the source file, textfinder.cpp.
\endlist

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\o Press \gui{Ctrl+S} to save your changes.

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For more information about designing forms with \QD, see the
\l{http://doc.trolltech.com/designer-manual.html}{Qt Designer Manual}.

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\section2 Completing the Header File

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The textfinder.h file already has the necessary #includes, a

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constructor, a destructor, and the \c{Ui} object. You need to add a private

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function, \c{loadTextFile()}, to read and display the

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contents of the input text file in the
\l{http://doc.trolltech.com/qtextedit.html}{QTextEdit}.
\list 1
\o In the \gui{Projects} view, double-click the \c{textfinder.h} file
to open it for editing.

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\o Add a private function
to the \c{private} section, after the \c{Ui::TextFinder} function, as

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illustrated by the following code snippet:

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\snippet examples/textfinder/textfinder.h 0

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\endlist

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\section2 Completing the Source File

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Now that the header file is complete, move on to the source file,

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textfinder.cpp.

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\list 1

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\o In the \gui{Projects} view, double-click the textfinder.cpp file

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to open it for editing.

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\o Add code to load a text file using
\l{http://doc.trolltech.com/qfile.html}{QFile}, read it with
\l{http://doc.trolltech.com/qtextstream.html}{QTextStream}, and
then display it on \c{textEdit} with

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\l{http://doc.trolltech.com/qtextedit.html#plainText-prop}{setPlainText()}.

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This is illustrated by the following code snippet:
\snippet examples/textfinder/textfinder.cpp 0
\o To use \l{http://doc.trolltech.com/qfile.html}{QFile} and
\l{http://doc.trolltech.com/qtextstream.html}{QTextStream}, add the
following #includes to textfinder.cpp:

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\snippet examples/textfinder/textfinder.cpp 1

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\o For the \c{on_findButton_clicked()} slot, add code to extract the search string and
use the \l{http://doc.trolltech.com/qtextedit.html#find}{find()} function

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to look for the search string within the text file. This is illustrated by
the following code snippet:

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\snippet examples/textfinder/textfinder.cpp 2

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\o Once both of these functions are complete, add a line to call \c{loadTextFile()} in
the constructor, as illustrated by the following code snippet:

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\snippet examples/textfinder/textfinder.cpp 3

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\endlist
The \c{on_findButton_clicked()} slot is called automatically in

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the uic generated ui_textfinder.h file by this line of code:
QMetaObject::connectSlotsByName(TextFinder);

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\section2 Creating a Resource File

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You need a resource file (.qrc) within which you embed the input
text file. The input file can be any .txt file with a paragraph of text.
Create a text file called input.txt and store it in the textfinder

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folder.

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\o Select \gui{File > New File or Project > Qt > Qt Resource File > OK}.

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\image qtcreator-add-resource-wizard.png "New File or Project dialog"

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The \gui {Choose the Location} dialog opens.

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\image qtcreator-add-resource-wizard2.png "Choose the Location dialog"

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\o In the \gui{Name} field, enter \bold{textfinder}.
\o In the \gui{Path} field, enter \c{C:\Qt\examples\TextFinder},
and click \gui{Next}.

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The \gui{Project Management} dialog opens.

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\image qtcreator-add-resource-wizard3.png "Project Management dialog"

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\o In the \gui{Add to project} field, select \bold{TextFinder.pro}

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and click \gui{Finish} to open the file in the code editor.

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\o Select \gui{Add > Add Prefix}.

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\o In the \gui{Prefix} field, replace the default prefix with a slash (/).
\o Select \gui{Add > Add Files}, to locate and add input.txt.
\image qtcreator-add-resource.png "Editing resource files"
Now that you have all the necessary files, click the \inlineimage qtcreator-run.png
button to compile your program.

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\previouspage creator-qml-inspector.html

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\page creator-version-control.html

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\nextpage adding-plugins.html

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Version control systems supported by Qt Creator are:

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\table
\header
\i \bold{Version Control System}
\i \bold{Address}
\i \bold{Notes}

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\row
\i \bold{git}
\i \l{http://git-scm.com/}

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\row
\i \bold{Subversion}
\i \l{http://subversion.tigris.org/}

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\row
\i \bold{Perforce}
\i \l{http://www.perforce.com}
\row
\i \bold{CVS}
\i \l{http://www.cvshome.org}
\i

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\row
\i \bold{Mercurial}
\i \l{http://mercurial.selenic.com/}
\i Qt Creator 2.0 and later

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\endtable

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Qt Creator uses the version control system's command line clients to access
your repositories. To set up the version control system's command line

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clients to access your repositories, make sure that the command line clients
can be located using the \c{PATH} environment variable or specify the path to
the command line client executables, in the settings pages shown by
\gui{Tools} > \gui{Options...}.
\section1 Setting Up Common Options
Select \gui{Tools} > \gui{Options...} > \gui{Version Control} > \gui{Common}
to view the common settings for version control systems. The following are
the options present in \gui{Common}:
\list
\o \gui{Submit message checking script} is a script or program that
can be used to perform checks on the submit message before
submitting. The submit message is passed in as the script's first
parameter. If there is an error, the script should output a
message on standard error and return a non-zero exit code.
\o \gui{User/alias configuration file} takes a file in mailmap format
that lists user names and aliases. For example:
\code
Jon Doe <Jon.Doe@company.com>
Hans Mustermann <Hans.Mustermann@company.com> hm <info@company.com>
\endcode
\note The second line above specifies the alias \e{hm} and the
corresponding email address for \e{Hans Mustermann}. If the
user/alias configuration file is present, the submit editor
displays a context menu with \gui{Insert name...} that pops up a
dialog letting the user select a name.
\o \gui{User fields configuration file} is a simple text file
consisting of lines specifying submit message fields that take
user names, for example:
\code
Reviewed-by:
Signed-off-by:
\endcode
\endlist

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The fields above appear below the submit message. They provide completion
for the aliases/public user names specified in the
\e{User/alias configuration file} as well as a button that opens the
aforementioned user name dialog.

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\section1 Creating VCS Repositories for New Projects
Qt Creator allows for creating VCS repositories for version
control systems that support local repository creation, such as
\bold{git} or \bold{hg}.
When creating a new project by selecting \gui File >
\gui{New File or Project...}, you can choose a version
control system in the final wizard page.

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The version control sub-menus are in \gui{Tools} > \gui{Options...}.
The \gui{Version Control} page also displays the
version control system managing the current project

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Under \gui{Application Output} > \gui{Version Control}, there is an output
pane showing the commands that are executed, prepended by a
timestamp and the relevant output.

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\image qtcreator-vcs-pane.png

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\section2 Adding Files
When you create a new file or a new project, the wizard displays a page
asking whether the files should be added to a version control system.
This happens when the parent directory or the project is already
under version control and the system supports the concept of adding files,
for example, \bold{Perforce} and \bold{Subversion}. Alternatively, you can
add files later by using the version control tool menus.
With \bold{git}, there is no concept of adding files. Instead, all modified
files must be staged for a commit.
\section2 Viewing Diff Output
All version control systems provide menu options to \e{diff} the current
file or project: to compare it with the latest version stored in the
repository and to display the differences. In Qt Creator, a diff is
displayed in a read-only editor. If the file is accessible, you can
double-click on a selected diff chunk and Qt Creator opens an editor
displaying the file, scrolled to the line in question.
\image qtcreator-vcs-diff.png

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\section2 Viewing Versioning History and Change Details
Display the versioning history of a file by selecting \gui{Log}
(for \bold{git}) or \gui{Filelog}(for \bold{Perforce} and
\bold{Subversion}). Typically, the log output contains the date, the commit
message, and a change or revision identifier. Click on the identifier to
display a description of the change including the diff.
Right-clicking on an identifier brings up a context menu that lets you
show annotation views of previous versions (see \l{Annotating Files}).
\image qtcreator-vcs-log.png
\image qtcreator-vcs-describe.png
\section2 Annotating Files
Annotation views are obtained by selecting \gui{Annotate} or \gui{Blame}.
Selecting \gui{Annotate} or \gui{Blame} displays the lines of the file
prepended by the change identifier they originate from. Clicking on the

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change identifier shows a detailed description of the change.

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To show the annotation of a previous version, right-click on the
version identifier at the beginning of a line and choose one of the
revisions shown at the bottom of the context menu. This allows you to
navigate through the history of the file and obtain previous versions of
it. It also works for \gui git/hg using SHA's.

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The same context menu is available when right-clicking on a version
identifier in the file log view of a single file.
Once you have finished making changes, submit them to the version control
system by choosing \gui{Commit} or \gui{Submit}. Qt Creator displays a
commit page containing a text editor where you can enter your commit
message and a checkable list of modified files to be included.
When you have finished filling out the commit page information, click on
\gui{Commit} to start committing.
The \gui{Diff Selected Files} button brings up a diff view of the
files selected in the file list. Since the commit page is just another
editor, you can go back to it by closing the diff view. You can also check
a diff view from the editor combo box showing the \gui{Opened files}.
\image qtcreator-vcs-commit.png
The git sub-menu contains additional entries:
\table

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\row

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\i \gui{Stash Snapshot...}

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\i Allows you to save a snapshot of your current
work under a name for later reference. For example, if you
want to try out something and find out later that it does not work,
you can discard it and return to the state of the snapshot.
\row
\i \gui{Stash}
\i Stash local changes prior to executing a \bold{pull}.
\row
\i \gui{Pull}
\i Pull changes from the remote repository. If there are locally
modified files, you are prompted to stash those changes.

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The \bold{git} settings page contains an option to do
a rebase operation while pulling.
\row

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\i \gui{Clean Repository.../Clean Project...}

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\i Collect all files that are not under version control
with the exception of patches and project files
and show them as a checkable list in a dialog
prompting for deletion. This lets you completely clean a build.
\row
\i \gui{Branches...}
\i Displays the branch dialog showing the local branches at the
top and remote branches at the bottom. To switch to the local
branch, double-click on it. Double-clicking on a remote
branch first creates a local branch with the same name that
tracks the remote branch, and then switches to it.
\image qtcreator-vcs-gitbranch.png

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\row
\i \gui{Stashes...}
\i Displays a dialog showing the stashes created by

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\gui{Stash Snapshot...} with options to restore,

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display or delete them.
/*!
\contentspage index.html
\previouspage creator-editor-refactoring.html
\page creator-editor-locator.html
\nextpage creator-project-managing.html
The locator provides one of the easiest ways in Qt Creator to browse
through projects, files, classes, methods, documentation and file systems.
You can find the locator in the bottom left of the Qt Creator window.
To activate the locator, press \key Ctrl+K (\key Cmd+K on Mac OS
X) or select \gui Tools > \gui Locate....
\image qtcreator-locator.png
To edit the currently open project's main.cpp file using the locator:

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\o Enter \tt{main.cpp}.
It is also possible to enter only a part of a search string.
As you type, the locator shows the occurrences of that string regardless

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of where in the name of an component it appears.
To narrow down the search results, you can use the following wildcard
characters:
\list

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\o To match any number of any or no characters, enter \bold{*}.
\o To match a single instance of any character, enter \bold{?}.
The \gui Locator allows you to browse not only files, but any items
defined by \bold{locator filters}. By default, the locator contains
filters which locate:
\list

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\o Files anywhere on your file system
\o Files belonging to your project, such as source, header resource,
and .ui files
\o Class and method definitions in your project or anywhere referenced
from your project
\o Help topics, including Qt documentation
\o Specific line in the document displayed in your editor
\endlist
To use a specific locator filter, type the assigned prefix followed by
\key Space. The prefix is usually a single character.

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\l{http://doc.trolltech.com/qdatastream.html}{QDataStream:}
\list 1
\o Activate the locator.
\o Enter \tt{\bold{: QDataStream}} (: (colon) followed by a
\key Space and the symbol name (QDataStream)).
By default the following filters are enabled and you do not need to use
their prefixes explicitly:
\list
\o Going to a line in the current file (l).
\o Going to an open file (o).
\o Going to a file in any open project (a).
\section2 Using the Default Locator Filters
The following locator filters are available by default:
\table
\header
\o Function
\row
\o Go to a line in the current file.
\o \tt{\bold{l \e{Line number}}}
\o \image qtcreator-locator-line.png
\row
\o \image qtcreator-locator-symbols.png
\row
\o \image qtcreator-locator-help.png
\row
\o Go to an open file.
\o \tt{\bold{o \e{File name}}}
\o \image qtcreator-locator-opendocs.png
\row
\o Go to a file in the file system (browse the file system).
\o \image qtcreator-locator-filesystem.png
\row
\o Go to a file in any project currently open.
\o \tt{\bold{a \e{File name}}}
\o \image qtcreator-locator-files.png
\row