macos - 在 Mac、Gnome、KDE ​​和 Windows 上使用 Qt 的平台原生首选项对话框

Question

在 Mac 和 Gnome 上， native 应用程序使用应用程序首选项对话框，该对话框会在选择时立即应用所选设置。在 Windows 和(我认为)KDE 上，仅当按下“应用”或“确定”按钮时才会应用首选项。

是否有任何内置的 Qt 好东西可以为您做这件事，或者您是否必须在对话框代码中包含几个 #ifdef 来处理这个 (Q_WS_WIN, Q_WS_MAC, Q_WS_X11)?

如果您以前做过类似的事情(甚至使用 #ifdef's)，您能否分享关于如何完成它的框架代码？

Answer 1

看来你必须自己旋转。以下是我们解决方案的重要部分。如果有人愿意，这可能会被推广。由于我们的业务规则可能会破坏其他应用程序，我还可以假设某些事情。切换是一个可以在编译时定义的宏:YOUR_APP_APPLY_PREFERENCES_IMMEDIATELY

preferences_dialog.h

class PreferencesDialog : public QDialog {
  Q_OBJECT

public:
  explicit PreferencesDialog(... various arguments ...,
                             QWidget *parent);
private slots:
  void ModifyMapLanguages();

private:
  void ApplyLanguageChanges(const QList<Language> &languages,
                            const QHash<LanguageKey, LanguageKey> &renames);
  void Initialize();

#ifndef YOUR_APP_APPLY_PREFERENCES_IMMEDIATELY
public slots:
  void accept();
private slots:
  void ApplyDialog();
private:
  QList<Language> pending_languages_;
  QHash<LanguageKey, LanguageKey> pending_language_renames_;
#endif
};

preferences_dialog.cpp

#include "forms/preferences_dialog.h"
#include "ui_preferences_dialog.h"

PreferencesDialog::PreferencesDialog(... various arguments ...,
                                     QWidget *parent) :
    QDialog(parent),
    ... various initializers ... {
  ui->setupUi(this);
  Initialize();
}

void PreferencesDialog::ApplyLanguageChanges(
    const QList<Language> &languages,
    const QHash<LanguageKey, LanguageKey> &renames) {
  // Do the actual changes here, whether immediate or postponed
}

void PreferencesDialog::Initialize() {
  // Disable the minimize and maximize buttons.
  Qt::WindowFlags flags = this->windowFlags();
  flags |= Qt::CustomizeWindowHint;
  flags &= ~Qt::WindowMinMaxButtonsHint;
  setWindowFlags(flags);

// buttons is the QDialogButtonBox with Ok, Cancel, and Apply buttons
#ifdef YOUR_APP_APPLY_PREFERENCES_IMMEDIATELY      
  ui->buttons->setVisible(false);
#else
  QPushButton *apply_button = ui->buttons->button(QDialogButtonBox::Apply);
  connect(apply_button, SIGNAL(clicked()), SLOT(ApplyDialog()));
#endif    
}

void PreferencesDialog::ModifyMapLanguages() {
  // Get the changes; in my case, they are coming from a dialog wizard
  LanguageSetupWizard wizard(map_->languages(), true, this);
  wizard.setWindowModality(Qt::WindowModal);
  if (QDialog::Accepted == wizard.exec()) {  
#ifdef YOUR_APP_APPLY_PREFERENCES_IMMEDIATELY
    ApplyLanguageChanges(wizard.languages(), wizard.language_renames());
#else
    pending_languages_ = wizard.languages();
    pending_language_renames_ = wizard.language_renames();
#endif
  }
}

#ifndef YOUR_APP_APPLY_PREFERENCES_IMMEDIATELY

void PreferencesDialog::ApplyDialog() {
  if (!pending_languages_.isEmpty()) {
    ApplyLanguageChanges(pending_languages_, pending_language_renames_);
  }
}

void PreferencesDialog::accept() {
  ApplyDialog();
  QDialog::accept();
}
#endif