Added dbus capture (flameshot-org#4605)

Author: borgmanJeremy

data/dbus/org.flameshot.Flameshot.xml

@@ -2,6 +2,13 @@
 <node>
   <interface name="org.flameshot.Flameshot">
 
+    <!--
+        captureScreen:
+
+        Open the GUI screenshot capture tool.
+    -->
+    <method name="captureScreen"/>
+
     <!--
         attachPin:
         @data: Byte array containing the screenshot and geometry information.

src/core/flameshotdbusadapter.cpp

@@ -2,6 +2,7 @@
 // SPDX-FileCopyrightText: 2017-2019 Alejandro Sirgo Rica & Contributors
 
 #include "flameshotdbusadapter.h"
+#include "core/flameshot.h"
 #include "core/flameshotdaemon.h"
 
 FlameshotDBusAdapter::FlameshotDBusAdapter(QObject* parent)
@@ -10,6 +11,11 @@ FlameshotDBusAdapter::FlameshotDBusAdapter(QObject* parent)
 
 FlameshotDBusAdapter::~FlameshotDBusAdapter() = default;
 
+void FlameshotDBusAdapter::captureScreen()
+{
+    Flameshot::instance()->gui(CaptureRequest(CaptureRequest::GRAPHICAL_MODE));
+}
+
 void FlameshotDBusAdapter::attachScreenshotToClipboard(const QByteArray& data)
 {
     FlameshotDaemon::instance()->attachScreenshotToClipboard(data);

src/core/flameshotdbusadapter.h

@@ -15,6 +15,7 @@ class FlameshotDBusAdapter : public QDBusAbstractAdaptor
     virtual ~FlameshotDBusAdapter();
 
 public slots:
+    Q_NOREPLY void captureScreen();
     Q_NOREPLY void attachScreenshotToClipboard(const QByteArray& data);
     Q_NOREPLY void attachTextToClipboard(const QString& text,
                                          const QString& notification);