itsmattkc
4dcc672b23
Ensures task errors are picked up and objects are deleted at the most appropriate times.
72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
#include "task.h"
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#include <QMessageBox>
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#include <QThread>
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TaskDialog::TaskDialog(Task* task, const QString& title, QWidget *parent) :
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ProgressDialog(task->GetTitle(), title, parent),
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task_(task),
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task_failed_(false)
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{
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thread_ = new QThread();
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// Connect the save manager progress signal to the progress bar update on the dialog
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connect(task_, &Task::ProgressChanged, this, &TaskDialog::SetProgress, Qt::QueuedConnection);
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// Connect error reporting
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connect(task_, &Task::Failed, this, &TaskDialog::TaskFailed, Qt::QueuedConnection);
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// Connect cancel signal (must be a direct connection or it'll be queued after the task has already finished)
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connect(this, &TaskDialog::Cancelled, task_, &Task::Cancel, Qt::DirectConnection);
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// Connect cleanup functions (ensure everything new'd in this function is deleteLater'd)
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connect(task_, &Task::Finished, this, &TaskDialog::close, Qt::QueuedConnection);
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// When task is finished, signal thread to quit
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connect(task_, &Task::Finished, thread_, &QThread::quit, Qt::QueuedConnection);
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// When thread has quit, delete both task and thread
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connect(thread_, &QThread::finished, task_, &Task::deleteLater, Qt::QueuedConnection);
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connect(thread_, &QThread::finished, thread_, &QThread::deleteLater, Qt::QueuedConnection);
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}
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void TaskDialog::showEvent(QShowEvent *e)
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{
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QDialog::showEvent(e);
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// Create a separate thread to run this task in
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thread_->start();
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// Move the task to this thread
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task_->moveToThread(thread_);
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// Start the task
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QMetaObject::invokeMethod(task_, "Start", Qt::QueuedConnection);
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}
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void TaskDialog::closeEvent(QCloseEvent *e)
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{
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// Show error if the task failed
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if (!task_->IsCancelled() && task_failed_) {
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QMessageBox::critical(this,
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tr("Error"),
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task_error_,
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QMessageBox::Ok);
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}
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// Cancel task if it is running
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task_->Cancel();
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// Standard close function
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QDialog::closeEvent(e);
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// Clean up this dialog (FIXME: Is this necessary?)
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deleteLater();
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}
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void TaskDialog::TaskFailed(const QString &s)
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{
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task_failed_ = true;
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task_error_ = s;
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}
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