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authorzecke <zecke>2003-09-03 10:04:28 (UTC)
committer zecke <zecke>2003-09-03 10:04:28 (UTC)
commita0dc2e500265eff0e76934cf02ef2aedb90cec0d (patch) (side-by-side diff)
tree29ea16c8a8808552e2ea4d4fc17d117feebdd909
parent88d625d9695582d57852f94581f71bb18c00a8a1 (diff)
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Add an Example Applet Now Tux grins from your Taskbar ;)
Diffstat (more/less context) (show whitespace changes)
-rw-r--r--examples/applet/config.in4
-rw-r--r--examples/applet/example.pro16
-rw-r--r--examples/applet/simpleimpl.cpp149
-rw-r--r--examples/applet/simpleimpl.h72
4 files changed, 241 insertions, 0 deletions
diff --git a/examples/applet/config.in b/examples/applet/config.in
new file mode 100644
index 0000000..6ea55d3
--- a/dev/null
+++ b/examples/applet/config.in
@@ -0,0 +1,4 @@
+ config APPLET_EXAMPLE
+ boolean "Applet Example"
+ default "y"
+ depends ( LIBQPE || LIBQPE-X11 ) && EXAMPLES
diff --git a/examples/applet/example.pro b/examples/applet/example.pro
new file mode 100644
index 0000000..3efd31e
--- a/dev/null
+++ b/examples/applet/example.pro
@@ -0,0 +1,16 @@
+CONFIG += warn_on qt
+
+TEMPLATE = lib
+DESTDIR = $(OPIEDIR)/plugins/applets
+TARGET = example
+
+SOURCES = simpleimpl.cpp
+HEADERS = simpleimpl.h
+
+INCLUDEPATH += $(OPIEDIR)/include
+DEPENDSPATH += $(OPIEDIR)/include
+
+LIBS += -lqpe
+
+
+include ( $(OPIEDIR)/include.pro )
diff --git a/examples/applet/simpleimpl.cpp b/examples/applet/simpleimpl.cpp
new file mode 100644
index 0000000..981e0ab
--- a/dev/null
+++ b/examples/applet/simpleimpl.cpp
@@ -0,0 +1,149 @@
+#include <qlabel.h>
+#include <qpainter.h>
+#include <qmessagebox.h>
+
+#include <qpe/applnk.h> // for AppLnk
+#include <qpe/resource.h> // for Resource loading
+
+#include "simpleimpl.h"
+
+
+SimpleApplet::SimpleApplet(QWidget *parent)
+ : QWidget( parent, "Simple Applet" ) {
+/*
+ * we will load an Image, scale it for the right usage
+ * remember your applet might be used by different
+ * resolutions.
+ * Then we will convert the image back to an Pixmap
+ * and draw this Pimxap. We need to use Image because its
+ * the only class that allows scaling.
+ */
+
+ QImage image = Resource::loadImage("Tux");
+ /*
+ * smooth scale to AppLnk smallIconSize for applest
+ * smallIconSize gets adjusted to the resolution
+ * so on some displays like SIMpad and a C-750 the smallIconSize
+ * is greater than on a iPAQ h3870
+ */
+ image = image.smoothScale(AppLnk::smallIconSize(), AppLnk::smallIconSize() );
+
+ /*
+ * now we need to convert the Image to a Pixmap cause these
+ * can be drawn more easily
+ */
+ m_pix = new QPixmap();
+ m_pix->convertFromImage( image );
+
+ /*
+ * Now we will say that we don't want to be bigger than our
+ * Pixmap
+ */
+ setFixedHeight(AppLnk::smallIconSize() );
+ setFixedWidth( AppLnk::smallIconSize() );
+
+}
+
+SimpleApplet::~SimpleApplet() {
+ delete m_pix;
+}
+
+
+/*
+ * here you would normal show or do something
+ * useful. If you want to show a widget at the top left
+ * of your icon you need to map your rect().topLeft() to
+ * global with mapToGlobal(). Then you might also need to
+ * move the widgets so it is visible
+ */
+void SimpleApplet::mousePressEvent(QMouseEvent* ) {
+ QMessageBox::information(this, tr("No action taken"),
+ tr("<qt>This Plugin does not yet support anything usefule aye.</qt>"),
+ QMessageBox::Ok );
+
+}
+
+void SimpleApplet::paintEvent( QPaintEvent* ) {
+ QPainter p(this);
+
+ /* simpy draw the pixmap from the start of this widget */
+ p.drawPixmap(0, 0, *m_pix );
+}
+
+/*
+ * Here comes the implementation of the interface
+ */
+SimpleAppletImpl::SimpleAppletImpl() {
+}
+/* needed cause until it is only pure virtual */
+SimpleAppletImpl::~SimpleAppletImpl() {
+}
+
+/*
+ * For the taskbar interface return a Widget
+ */
+QWidget* SimpleAppletImpl::applet( QWidget* parent ) {
+ /* ownership has the parent */
+ return new SimpleApplet( parent );
+}
+
+/*
+ * A small hint where the Applet Should be displayed
+ */
+int SimpleAppletImpl::position()const {
+ return 1;
+}
+
+
+/*
+ * Now the important QUnkownInterface method without
+ * this one your applet won't load
+ * @param uuid The uuid of the interface
+ * @param iface The pointer to the interface ptr
+ */
+QRESULT SimpleAppletImpl::queryInterface( const QUuid& uuid, QUnknownInterface** iface) {
+ /* set the pointer to the interface to 0 */
+ *iface = 0;
+
+ /*
+ * we check if we support the requested interface
+ * and then assign to the pointer.
+ * You may alos create another interface here so
+ * *iface = this is only in this simple case true you
+ * could also support more interfaces.
+ * But this example below is the most common use.
+ * Now the caller knows that the Interface Pointer
+ * is valid and the interface supported
+ */
+ if ( uuid == IID_QUnknown )
+ *iface = this;
+ else if ( uuid == IID_TaskbarApplet )
+ *iface = this;
+ else
+ return QS_FALSE;
+
+ if ( *iface )
+ (*iface)->addRef();
+
+ return QS_OK;
+}
+
+
+/*
+ * Finally we need to export the Interface.
+ * CREATE_INSTANCE creates a interface and calls
+ * queryInterface for the QUnknownInterface once
+ * With out this function the applet can't be loaded.
+ *
+ * NOTE: If your applet does not load it's likely you've an
+ * unresolved symbol. Change the .pro TEMPLATE = lib to TEMPLATE= app
+ * and recompile. If the linker only complains about a missing
+ * main method the problem is more complex. In most cases it'll say
+ * you which symbols are missing and you can implement them.
+ * The main(int argc, char* argv[] ) does not need to be
+ * included in a library so it's ok that the linker complains
+ */
+Q_EXPORT_INTERFACE() {
+ Q_CREATE_INSTANCE( SimpleAppletImpl )
+}
+
diff --git a/examples/applet/simpleimpl.h b/examples/applet/simpleimpl.h
new file mode 100644
index 0000000..8459c96
--- a/dev/null
+++ b/examples/applet/simpleimpl.h
@@ -0,0 +1,72 @@
+/*
+ * You may use, modify and distribute without any limitation
+ */
+
+/**
+ * Opie and Qtopia uses a component system called QCOM
+ * which was first part of the Qt 3.0 API but was made
+ * prviate during the betas. Opie and Qtopia still use it
+ * and we're happy with it.
+ * Every starts with the QUnknownInterface. It supports functions
+ * for reference counting and the most important one
+ * is for a query. Every QCOM interface got a global unique id ( GUID,UUID )
+ * query is used to see if a interface is supported by
+ * a dynamic shared object ( dso / plugin )
+ * For tasks like loading Applications, InputMethods, Today, MenuButton,
+ * Taskbar, Style, Email Client there are specefic Interfaces you
+ * need to implement. The interfaces inherits from QUnknownInterface and
+ * you'll need inherit from the interface.
+ * As example we will use the Taskbar interface
+ */
+
+#ifndef SIMPLE_OPIE_EXAMPLE_APPLET_H
+#define SIMPLE_OPIE_EXAMPLE_APPLET_H
+
+/*
+ * The taskbar applet interfaces wants us to implement position() and applet()
+ * additionally we need to implement add(), release() and queryInterface for QUnknownInterface
+ * luckiy there is a macro for the reference counting
+ * We provide an Implementation of the interface.
+ */
+#include <qwidget.h>
+#include <qpe/taskbarappletinterface.h>
+
+
+/*
+ * Because we only draw an Icon in a fixed width and height
+ * we declare and define SimpleApplet here and you could use QLabel
+ * setPixmap or use QWidget and draw yourself.
+ * You might also want to reimplement mouse*Event to use some simple actions
+ */
+class SimpleApplet : public QWidget {
+ Q_OBJECT
+public:
+ SimpleApplet(QWidget *parent);
+ ~SimpleApplet();
+private:
+ void mousePressEvent( QMouseEvent* );
+ void paintEvent( QPaintEvent* );
+ QPixmap *m_pix;
+};
+
+class SimpleAppletImpl : public TaskbarAppletInterface {
+public:
+
+ SimpleAppletImpl();
+ virtual ~SimpleAppletImpl();
+
+ QRESULT queryInterface( const QUuid&, QUnknownInterface** );
+
+ QWidget *applet( QWidget* parent );
+ int position()const;
+
+ /*
+ * macro for reference countint
+ * if reference drops to zero
+ * delete this is called
+ */
+ Q_REFCOUNT
+};
+
+
+#endif