dialog.cc

c++的guiQt做的开发

/** @file
 Dialog - class with various static dialogs:<br>
 openFileDialog - pick a filename for opening it<br>
 saveFileDialog - pick a filename for saving as<br>
 colorDialog - dialog for selecting color<br>
 readStringDialog - Ask user a question end expect him to enter some string as answer<br>
 @author Martin Petricek
*/
#include "dialog.h"
#include "settings.h"
#include "version.h"
#include <QDir>
#include <QInputDialog>
#include <QMessageBox>
#include <QFileDialog>
#include <QColorDialog>
#include <QFileInfo>
#include <QString>
#include "util.h"

namespace gui {

/**
 Get current directory from File Dialog
 @param fd File Dialog
 @return current directory
*/
QString getDir(QFileDialog &fd) {
 QDir d=fd.directory();
 return d.absolutePath();
}

/**
 Generic "Open file" dialog.
 Wait for user to select one existing file and return its name.
 Will return NULL if user cancels the dialog.
 @param parent Parent widget - will be disabled during the dialog.
 @param caption Caption used in dialog title
 @param settingName Key in settings used to save/load dialog window position
 @param savePath Key in settings used to identify where to save last used directory in the dialog
 @param filters Filters available to user to restrict shown filetypes in dialog
 @return selected Filename (or NULL)
*/
QString openFileDialog(QWidget* parent,const QString &caption/*=QString::null*/,const QString &settingName/*=QString::null*/,const QStringList &filters/*=QString::null*/,const QString &savePath/*=QString::null*/) {
 QFileDialog fd(parent);
 if (filters.size()) {
  //Set filters if filters specified
  fd.setFilters(filters);
 }
// fd.setShowHiddenFiles(TRUE);
 if (!caption.isNull()) fd.setWindowTitle(caption);
 if (savePath.isNull()) {
  //No save path specified -> start in current directory
  fd.setDirectory(".");
 } else {
  //Try to set last used saved path, if it exists
  fd.setDirectory(globalSettings->read("history/path/"+savePath,"."));
 }
 fd.setFileMode(QFileDialog::ExistingFile);

 // "Infinite" loop, to restart the dialog if necessary (invalid file selected, etc ... )
 for(;;) {
  if (!settingName.isNull()) {
   // Restore window position from settings if applicable
   globalSettings->restoreWindow(&fd,settingName);
  }
  if (fd.exec()==QDialog::Accepted) {	//Dialog accepted
   if (!settingName.isNull()) {
    // Save window position to settings if applicable
    globalSettings->saveWindow(&fd,settingName);
   }
   if (!savePath.isNull()) {
    //Save the path if desired
    if (globalSettings->readBool("history/save_filePath",true)) {
     //Note that there is only one central setting "save paths in dialog" for all dialog types
     globalSettings->write("history/path/"+savePath,getDir(fd));
    }
   }
   QString name;
   QStringList files = fd.selectedFiles();
   if (!files.isEmpty()) name = files[0];
   if (QFileInfo(name).isDir()) { //directory was selected
    /** \todo  test this ! */
    fd.setDirectory(name);
    continue;//restart dialog
   }
   return name;
  }
  return QString::null;
 }
}

/**
 Invoke generic "save file" dialog. Wait for user to select or type a single file and return its name.
 Will return NULL if user cancels the dialog.
 @param parent Parent widget - will be disabled during the dialog.
 @param oldname Name of file to be saved - if specified, this name will be pre-selected.
 @param askOverwrite If true and selected file exists, user will be asked to confirm overwriting it
 @param caption Caption used in dialog title
 @param settingName Key in settings used to save/load dialog window position
 @param savePath Key in settings used to identify where to save last used directory in the dialog
 @param filters Filters available to user to restrict shown filetypes in dialog
 @return selected Filename (or NULL)
*/
QString saveFileDialog(QWidget* parent,const QString &oldname,bool askOverwrite/*=true*/,const QString &caption/*=QString::null*/,const QString &settingName/*=QString::null*/,const QStringList &filters/*=QString::null*/,const QString &savePath/*=QString::null*/) {
 QFileDialog fd(parent);
 if (filters.size()) {
  //Set filters if filters specified
  fd.setFilters(filters);
 }
// fd.setShowHiddenFiles(TRUE);
 if (!caption.isNull()) fd.setWindowTitle(caption);
 if (savePath.isNull()) {
  //No save path specified -> start in current directory
  fd.setDirectory(".");
 } else {
  //Try to set last used saved path, if it exists
  fd.setDirectory(globalSettings->read("history/path/"+savePath,"."));
 }
 if (!oldname.isNull()) fd.selectFile(oldname);
 fd.setFileMode(QFileDialog::AnyFile);
 //Name that will hold the file (if some is picked)
 QString name;
 // "Infinite" loop, to restart the dialog if necessary (invalid file selected, etc ... )
 for(;;) {
  if (!settingName.isNull()) {
   // Restore window position from settings if applicable
   globalSettings->restoreWindow(&fd,settingName);
  }
  if (fd.exec()==QDialog::Accepted) {
   if (!settingName.isNull()) {
    // Save window position to settings if applicable
    globalSettings->saveWindow(&fd,settingName);
   }
   QStringList files = fd.selectedFiles();
   if (!files.isEmpty()) name = files[0]; else name=QString::null;
   /** \todo check if not directory */
   if (askOverwrite && QFile::exists(name)) {
    //File exists : ask if it should be overwritten
    int answer=QMessageBox::question(parent,APP_NAME,
     QObject::tr("File called \"%1\" already exists. Do you want to overwrite it?").arg(name),
     QObject::tr("&Yes"),QObject::tr("&No"),QObject::tr("&Cancel"),1,2);
    if (answer==0) {				 //Yes, overwrite is ok
     //Break from the cycle mean valid file was selected
     break;
    }
    if (answer==1) continue;			//No, restart dialog and ask for another file
    if (answer==2) return QString::null;	//Cancel, do not overwrite and exit
   }
   //Not asking about overwrite
   //Break from the cycle mean valid file was selected
   break;
  }
  //Dialog cancelled
  if (!settingName.isNull()) {
   // Save window position to settings if applicable
   globalSettings->saveWindow(&fd,settingName);
  }
  return QString::null;
 } //End of not-so-infinite for cycle

 if (!savePath.isNull()) {
  //Save the path if desired
  if (globalSettings->readBool("history/save_filePath",true)) {
   //Note that there is only one central setting "save paths in dialog" for all dialog types
   globalSettings->write("history/path/"+savePath,getDir(fd));
  }
 }
 return name;
}

/**
 Invoke "read string" dialog. Show message and wait for user to type any string,
 Will return NULL if user cancels the dialog.
 @param parent Parent widget - will be disabled during the dialog.
 @param message Message to show in the dialog
 @param def Default text that will be pre-typed in the dialog
 @return typed text, or NULL if dialog cancelled
 */
QString readStringDialog(QWidget* parent,const QString &message, const QString &def) {
 bool ok=FALSE;
 QString res=QInputDialog::getText(parent,APP_NAME,message,QLineEdit::Normal,def,&ok);
 if (ok) return res;
 return QString::null;
}

/**
 Invoke dialog to select color.
 Last selected color is remembered and offered as default next time.
 The 'initial default color' is red
 @param parent Parent widget - will be disabled during the dialog.
 @return selected color. If dialog is cancelled, 'invalid' color is returned
*/
QColor colorDialog(QWidget* parent) {
 static QColor defaultColor=Qt::red;
 QColor ret=QColorDialog::getColor(defaultColor,parent);
 if (ret.isValid()) defaultColor=ret;
 return ret;
}

/**
 Asks question with Yes/No answer. "Yes" is default.
 Return true if user selected "yes", false if user selected "no"
 @param msg Question to display
 @param parent Parent widget - will be disabled during the dialog.
 @return True if yes, false if no
*/
bool questionDialog(QWidget* parent,const QString &msg) {
 int answer=QMessageBox::question(parent,APP_NAME,msg,QObject::tr("&Yes"),QObject::tr("&No"),QString::null,0,1);
 return (answer==0);
}

} // namespace gui