You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
240 lines
11 KiB
240 lines
11 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/toplevel/toplevel.doc:1 -->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>Toplevel Widgets</title>
|
|
<style type="text/css"><!--
|
|
fn { margin-left: 1cm; text-indent: -1cm; }
|
|
a:link { color: #004faf; text-decoration: none }
|
|
a:visited { color: #672967; text-decoration: none }
|
|
body { background: #ffffff; color: black; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
|
|
<table border="0" cellpadding="0" cellspacing="0" width="100%">
|
|
<tr bgcolor="#E5E5E5">
|
|
<td valign=center>
|
|
<a href="index.html">
|
|
<font color="#004faf">Home</font></a>
|
|
| <a href="classes.html">
|
|
<font color="#004faf">All Classes</font></a>
|
|
| <a href="mainclasses.html">
|
|
<font color="#004faf">Main Classes</font></a>
|
|
| <a href="annotated.html">
|
|
<font color="#004faf">Annotated</font></a>
|
|
| <a href="groups.html">
|
|
<font color="#004faf">Grouped Classes</font></a>
|
|
| <a href="functions.html">
|
|
<font color="#004faf">Functions</font></a>
|
|
</td>
|
|
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Toplevel Widgets</h1>
|
|
|
|
|
|
|
|
<p>
|
|
This example demonstrates the use of TQt's widget flags to provide
|
|
toplevel widgets with customized window decorations.
|
|
<p> It provides a graphical user interface for selecting different
|
|
options for widget decoration and behavior, and passes the
|
|
appropriate widget flags to the <a href="tqwidget.html">TQWidget</a> constructor.
|
|
<a href="tqwidget.html#reparent">TQWidget::reparent</a>() is used to change the widget flags at runtime.
|
|
<p> <b>Warning:</b> Note that the interpretation and functionality of the
|
|
widget flags depends on the window manager used when running the
|
|
application. Many window managers do not support every possible flag
|
|
combination.
|
|
<p> The user interface providing the different options was created using
|
|
<a href="designer-manual.html">TQt Designer</a>. The different
|
|
options are explained in the user interface through the use of
|
|
tooltips and What's This help. Load the <tt>options.ui</tt> file into
|
|
<a href="designer-manual.html">TQt Designer</a> for more details.
|
|
<p>
|
|
|
|
<pre> #include <<a href="qapplication-h.html">ntqapplication.h</a>>
|
|
#include "options.h"
|
|
|
|
int main( int argc, char ** argv )
|
|
{
|
|
<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
|
|
OptionsDialog dlg;
|
|
return dlg.exec();
|
|
}
|
|
</pre>
|
|
<p> The main function creates and displays the dialog for the user
|
|
interface. Note that this dialog is modal.
|
|
<p> The code relevant for this example is in the <tt>options.ui.h</tt>
|
|
file.
|
|
<p>
|
|
|
|
<pre> void OptionsDialog::apply()
|
|
{
|
|
<a href="tqstringlist.html">TQStringList</a> flagList;
|
|
bool wstyle = false;
|
|
WFlags f = WDestructiveClose | WType_TopLevel | WStyle_Customize;
|
|
</pre>
|
|
<p> The <tt>apply()</tt> slot declares the <a href="tqt.html#WidgetFlags">widget flag</a> variable <tt>f</tt>
|
|
and initializes it with the values
|
|
<ul>
|
|
<li> <tt>WDestructiveClose</tt> - the widget will be automatically
|
|
destroyed when it is closed,
|
|
<li> <tt>WType_TopLevel</tt> - the widget will be top level even if it
|
|
has a parent widget, and
|
|
<li> <tt>WStyle_Customize</tt> - the flags override the default values
|
|
</ul>
|
|
Other flags are used depending on the options selected in the user
|
|
interface.
|
|
<p> <pre> if ( bgBorder->isChecked() ) {
|
|
if ( rbBorderNormal->isChecked() ) {
|
|
f |= WStyle_NormalBorder;
|
|
flagList += "WStyle_NormalBorder";
|
|
wstyle = true;
|
|
}
|
|
else if ( rbBorderDialog->isChecked() ) {
|
|
f |= WStyle_DialogBorder;
|
|
flagList += "WStyle_DialogBorder";
|
|
wstyle = true;
|
|
}
|
|
</pre>The window gets a normal or dialog border depending on the selected
|
|
option.
|
|
<p> <pre> if ( bgTitle->isChecked() ) {
|
|
f |= WStyle_Title;
|
|
flagList += "WStyle_Title";
|
|
wstyle = true;
|
|
if ( cbTitleSystem->isChecked() ) {
|
|
f |= WStyle_SysMenu;
|
|
flagList += "WStyle_SysMenu";
|
|
}
|
|
if ( cbTitleMinimize->isChecked() ) {
|
|
f |= WStyle_Minimize;
|
|
flagList += "WStyle_Minimize";
|
|
}
|
|
if ( cbTitleMaximize->isChecked() ) {
|
|
f |= WStyle_Maximize;
|
|
flagList += "WStyle_Maximize";
|
|
}
|
|
if ( cbTitleContext->isChecked() ) {
|
|
f |= WStyle_ContextHelp;
|
|
flagList += "WStyle_ContextHelp";
|
|
}
|
|
}
|
|
</pre>A titlebar with controls is provided if the appropriate options
|
|
have been checked.
|
|
<p> <pre> } else {
|
|
f |= WStyle_NoBorder;
|
|
flagList += "WStyle_NoBorder";
|
|
wstyle = true;
|
|
}
|
|
</pre>If the window should not have a border it cannot have a titlebar.
|
|
Widgets that provide their own (e.g. themed) window decoration
|
|
should use this flag.
|
|
<p> <pre> <a href="tqwidget.html">TQWidget</a> *parent = this;
|
|
if ( cbBehaviorTaskbar->isChecked() ) {
|
|
parent = 0;
|
|
f |= WGroupLeader;
|
|
flagList += "WGroupLeader";
|
|
}
|
|
</pre>If a toplevel widget has a parent it will not have a taskbar
|
|
entry, and on most window managers it will always stay on
|
|
top of the parent widget. This is the standard behavior for
|
|
dialog boxes, especially if they are modeless, and for other
|
|
secondary toplevel widgets.
|
|
<p> To provide a taskbar entry the widget must have no parent,
|
|
in which case we need to use the <tt>WGroupLeader</tt> flag to
|
|
prevent blocking through the modal main dialog. Applications
|
|
that can have multiple toplevel windows open simultaneously
|
|
should use this combination.
|
|
<p> <pre> if ( cbBehaviorStays->isChecked() ) {
|
|
f |= WStyle_StaysOnTop /*| WX11BypassWM*/;
|
|
flagList += "WStyle_StaysOnTop";
|
|
wstyle = true;
|
|
}
|
|
</pre>A toplevel widget can stay on top of the whole desktop if the
|
|
window manager supports this functionality.
|
|
<a href="#footnote1"><sup>(1)</sup></a><a name="footnote-call1"></a>
|
|
<p> Widgets that display important or realtime information (i.e. IRC
|
|
clients) might benefit from using that flag.
|
|
<p> <pre> if ( cbBehaviorPopup->isChecked() ) {
|
|
f |= WType_Popup;
|
|
flagList += "WType_Popup";
|
|
}
|
|
</pre>A popup widget is a short lived modal widget that closes
|
|
automatically. Popup menus are a typical example for such widgets.
|
|
<p> <pre> if ( cbBehaviorModal->isChecked() ) {
|
|
f |= WShowModal;
|
|
flagList += "WShowModal";
|
|
}
|
|
</pre>A modal widget blocks input to other toplevel widgets, unless
|
|
those are in a different modal group (see <tt>WGroupLeader</tt>).
|
|
Dialogs are often modal, and the <a href="tqdialog.html">TQDialog</a> class provides an easy API
|
|
to create and display them without the need to explicitly use this
|
|
flag.
|
|
<p> <pre> if ( cbBehaviorTool->isChecked() ) {
|
|
f |= WStyle_Tool;
|
|
flagList += "WStyle_Tool";
|
|
wstyle = true;
|
|
}
|
|
|
|
if (wstyle)
|
|
<a name="x2534"></a> flagList.<a href="tqvaluelist.html#push_front">push_front</a>("WStyle_Customize");
|
|
</pre>A tool window will never have a task bar entry (even if it
|
|
has no parent widget), and often has a smaller window
|
|
decoration. Tool windows are frequently used instead of
|
|
modeless dialogs.
|
|
<p> <pre> if ( !widget ) {
|
|
widget = new <a href="tqvbox.html">TQVBox</a>( parent, 0, f );
|
|
<a name="x2530"></a> widget-><a href="tqframe.html#setMargin">setMargin</a>( 20 );
|
|
<a name="x2533"></a> <a href="tqlabel.html">TQLabel</a> *label = new <a href="tqlabel.html">TQLabel</a>(flagList.<a href="tqstringlist.html#join">join</a>("&nbsp;| "), widget);
|
|
<a name="x2532"></a> label-><a href="tqlabel.html#setTextFormat">setTextFormat</a>(RichText);
|
|
<a name="x2531"></a> label-><a href="tqlabel.html#setAlignment">setAlignment</a>(WordBreak);
|
|
<a href="tqpushbutton.html">TQPushButton</a> *okButton = new <a href="tqpushbutton.html">TQPushButton</a>( "Close", widget );
|
|
<a name="x2535"></a> connect( okButton, TQ_SIGNAL(<a href="tqbutton.html#clicked">clicked</a>()), widget, TQ_SLOT(<a href="tqwidget.html#close">close</a>()) );
|
|
<a name="x2537"></a> widget-><a href="tqwidget.html#move">move</a>( pos() );
|
|
</pre>The widget is created if it has not been created yet, or if it was
|
|
closed (since we use the <tt>WDestructiveClose</tt> flag). Note that the
|
|
window is not visible yet.
|
|
<a href="#footnote2"><sup>(2)</sup></a><a name="footnote-call2"></a>
|
|
<p> <pre> } else {
|
|
<a name="x2538"></a><a name="x2536"></a> widget-><a href="tqwidget.html#reparent">reparent</a>( parent, f, widget-><a href="tqwidget.html#geometry">geometry</a>().topLeft(), FALSE);
|
|
}
|
|
</pre>If the widget has already been created the reparent() function is
|
|
used to modify the widget's flags. The widget's geometry is not
|
|
changed, and the window is not shown again.
|
|
<p> <pre> <a name="x2539"></a> widget-><a href="tqwidget.html#setCaption">setCaption</a>( leCaption->text() );
|
|
<a name="x2540"></a> widget-><a href="tqwidget.html#setIcon">setIcon</a>( leIcon->text() );
|
|
<a name="x2541"></a> widget-><a href="tqwidget.html#setWindowOpacity">setWindowOpacity</a>(double(slTransparency->maxValue() - slTransparency->value()) / 100);
|
|
|
|
<a name="x2542"></a> widget-><a href="tqwidget.html#show">show</a>();
|
|
</pre>Finally the higher level properties such as the window's caption and
|
|
icon are set. The window transparency is set according to the slider
|
|
value. Note that this will only have effect on systems that support
|
|
this attribute for toplevel window.
|
|
<p> <pre> }
|
|
</pre>Finally the window is shown with the new attributes.
|
|
<p> To build the example go to the toplevel directory
|
|
(<tt>TQTDIR/examples/toplevel</tt>)
|
|
<a href="#footnote3"><sup>(3)</sup></a><a name="footnote-call3"></a>
|
|
and run <tt>qmake</tt> to generate the makefile, then use the make tool to
|
|
build the library.
|
|
|
|
<hr>
|
|
<ol> <li><a name="footnote1"></a>
|
|
Unfortunately some X11 window managers also require the <tt>WX11BypassWM</tt> flag to be set in addition; but some other X11 window
|
|
managers will have problems if this flag is set. <a href="#footnote-call1">Back...</a> <li><a name="footnote2"></a>
|
|
The example uses <a href="tqguardedptr.html">TQGuardedPtr</a> to make sure that the
|
|
pointer is reset to zero when the widget object is destroyed
|
|
due to the <tt>WDestructiveClose</tt> flag. <a href="#footnote-call2">Back...</a> <li><a name="footnote3"></a>
|
|
|
|
We use <tt>TQTDIR</tt> to stand for the directory where TQt is installed.
|
|
<a href="#footnote-call3">Back...</a></ol>
|
|
</hr><p>See also <a href="examples.html">Examples</a>.
|
|
|
|
<!-- eof -->
|
|
<p><address><hr><div align=center>
|
|
<table width=100% cellspacing=0 border=0><tr>
|
|
<td>Copyright © 2007
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|