Implement single method capture request

The core now has a method requestCapture, which receives a
CaptureRequest object with all the needed information.
This reduces code duplication in future features.

src/core/capturerequest.cpp

@@ -0,0 +1,81 @@
+// Copyright(c) 2017-2018 Alejandro Sirgo Rica & Contributors
+//
+// This file is part of Flameshot.
+//
+//     Flameshot is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+//
+//     Flameshot is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with Flameshot.  If not, see <http://www.gnu.org/licenses/>.
+
+#include "capturerequest.h"
+#include "src/utils/screenshotsaver.h"
+#include <QVector>
+#include <QDateTime>
+
+CaptureRequest::CaptureRequest(CaptureRequest::CaptureMode mode,
+                               const uint delay, const QString &path,
+                               CaptureRequest::ExportTask tasks) :
+    m_mode(mode), m_delay(delay), m_path(path), m_tasks(tasks),
+    m_forcedID(false), m_id(0)
+{
+
+}
+
+void CaptureRequest::setStaticID(uint id) {
+    m_forcedID = true;
+    m_id = id;
+}
+
+uint CaptureRequest::id() const {
+    if (m_forcedID) {
+        return m_id;
+    }
+
+    uint id = 0;
+    QVector<uint>v;
+    v << qHash(m_mode) << qHash(m_delay * QDateTime::currentMSecsSinceEpoch())
+      << qHash(m_path) << qHash(m_tasks);
+    for(uint i : v) {
+        id ^= i + 0x9e3779b9 + (id << 6) + (id >> 2);
+    }
+    return id;
+}
+
+CaptureRequest::CaptureMode CaptureRequest::captureMode() const {
+    return m_mode;
+}
+
+uint CaptureRequest::delay() const {
+    return m_delay;
+}
+
+QString CaptureRequest::path() const {
+    return m_path;
+}
+
+void CaptureRequest::addTask(CaptureRequest::ExportTask task) {
+    m_tasks |= task;
+}
+
+void CaptureRequest::exportCapture(const QPixmap &p) {
+    if ((m_tasks & ExportTask::FILESYSTEM_SAVE_TASK) != ExportTask::NO_TASK) {
+        if (m_path.isEmpty()) {
+            ScreenshotSaver().saveToFilesystemGUI(p);
+        } else {
+            ScreenshotSaver().saveToFilesystem(p, m_path);
+        }
+    }
+
+    if ((m_tasks & ExportTask::CLIPBOARD_SAVE_TASK) != ExportTask::NO_TASK) {
+        ScreenshotSaver().saveToClipboard(p);
+    }
+
+}