Native of filebrowse using and the cascading Save dialog box
In my application I need to open file and file save dialog box when a specific button is clicked. I looked at the docs of stunts, but I found that the native options. Tried the native alert dialog, change of filebrowse dialog type. It displays well on Simulator, but could not get any output file that will be used in the Qt code.
I pass these parameters
int * num = NULL;
char * folder [1024];
dialog_update (alert_dialog);
to dialog_event_get_filebrowse_filepaths(event,file,num), but it always returns BPS_FAILURE.
In addition,
Here is my code:
//slot function
void App::fileOpen(){
//===========================
dialog_instance_t alert_dialog = 0;
bps_initialize();
dialog_request_events(0); //0 indicates that all events are requested
if (dialog_create_filebrowse(&alert_dialog) != BPS_SUCCESS) {
fprintf(stderr, "Failed to create alert dialog.");
return ;
}
const char* extensions[] = {"*.*","*.jpg","*.jpeg","*.mp3","*.wav","*.mp4","*.txt","*.doc","*.pdf"};
int items = 9;
if(dialog_set_filebrowse_filter(alert_dialog, extensions,items) != BPS_SUCCESS){
fprintf(stderr, "Failed to set alert dialog message text.");
dialog_destroy(alert_dialog);
alert_dialog = 0;
return ;
}
if( dialog_set_filebrowse_multiselect(alert_dialog,FALSE)!=BPS_SUCCESS){
fprintf(stderr, "Failed to set alert dialog message text.");
dialog_destroy(alert_dialog);
alert_dialog = 0;
return ;
}
if (dialog_show(alert_dialog) != BPS_SUCCESS) {
fprintf(stderr, "Failed to show alert dialog.");
dialog_destroy(alert_dialog);
alert_dialog = 0;
return ;
}
int shutdown =0;
while (!shutdown) {
bps_event_t *event = NULL;
bps_get_event(&event, -1); // -1 means that the function waits
// for an event before returning
if (event) {
if (bps_event_get_domain(event) == dialog_get_domain()) {
int selectedIndex =
dialog_event_get_selected_index(event);
const char* label =
dialog_event_get_selected_label(event);
const char* context =
dialog_event_get_selected_context(event);
char **fileArray[]={};
int *numFiles = NULL;
//
if(selectedIndex == 0){
shutdown = 1;//user press the cancel button on dialog; close the dialog
}
else if(selectedIndex == 1){
if(dialog_event_get_filebrowse_filepaths(event,file,num)!=BPS_SUCCESS){
fprintf(stderr,"File open fail");
}
else{
//debug purposes
fprintf(stderr,"File array: %d/n",sizeof(file)*1024);
fprintf(stderr,"Num files: %n",num);
//fprintf(stderr,"Files int: %d",files);
}
}
}
}
}
if (alert_dialog) {
dialog_destroy(alert_dialog);
}
//===========================
}
Native Subforums have no useful information on this subject. Any help is greatly appreciated
Hello again, here's the example as promised.
To use the native filebrowse dialog box, the native code must run in its own thread to prevent the user interface in the Cascades to block. This is achieved by encapsulating all the dialog box code in a class derived from QThread. The class I wrote is called FileBrowseDialog
FileBrowseDialog.hpp
#ifndef FILEBROWSEDIALOG_HPP_ #define FILEBROWSEDIALOG_HPP_ #include#include #include /* * The file browse dialog displays a dialog to browse and select * files from shared folders on the system. */ class FileBrowseDialog : public QThread { Q_OBJECT /* * QML property to allow multiple selection */ Q_PROPERTY(bool multiselect READ getMultiSelect WRITE setMultiSelect) /* * QML property to read the selected filenames */ Q_PROPERTY(QVariant filepaths READ getFilePaths) /* * QML property to set or get the file filters. This is an * list array variant. */ Q_PROPERTY(QVariant filters READ getFilters WRITE setFilters) public: /* * Ctor and Dtor */ FileBrowseDialog(QObject* parent = 0); virtual ~FileBrowseDialog(); /* * Exposed to QML to start the run loop which creates and displays the dialog. * The dialog is shown until a button is clicked. */ Q_INVOKABLE void show(); public: /* * Getter for the selected filenames QML property */ QVariant getFilePaths() const; /* * Setter and Getter for the filters QML property */ QVariant getFilters() const; void setFilters(QVariant const& value); /* * Getter and Setter for the multiselect QML property */ bool getMultiSelect() const; void setMultiSelect(bool value); signals: /* * Signal emitted when the OK button has been clicked on the browse dialog * The OK button is not enabled unless a file is selected */ void selectionCompleted(); /* * Signal emitted when the cancel button has been clicked on the browse dialog */ void selectionCancelled(); protected: /* * Implements the run loop. Dialog stays open until a button is clicked. */ virtual void run(); protected: dialog_instance_t m_dialog; bool m_multiSelect; QVariantList m_filePaths; QVariantList m_filters; }; #endif /* FILEBROWSEDIALOG_HPP_ */
FileBrowseDialog.cpp
#include "FileBrowseDialog.hpp" #include#include FileBrowseDialog::FileBrowseDialog(QObject* parent) : QThread(parent) , m_multiSelect(false) { m_filters.push_back(QString("*.*")); } FileBrowseDialog::~FileBrowseDialog() { } void FileBrowseDialog::show() { if (!isRunning()) { m_filePaths.clear(); start(); } } QVariant FileBrowseDialog::getFilePaths() const { return m_filePaths; } bool FileBrowseDialog::getMultiSelect() const { return m_multiSelect; } void FileBrowseDialog::setMultiSelect(bool value) { m_multiSelect = value; } QVariant FileBrowseDialog::getFilters() const { return m_filters; } void FileBrowseDialog::setFilters(QVariant const& value) { m_filters = value.toList(); qDebug() << "filter count: " << m_filters.count(); } void FileBrowseDialog::run() { bps_initialize(); //request all dialog events dialog_request_events(0); if (dialog_create_filebrowse(&m_dialog) != BPS_SUCCESS) { qDebug() << "Failed to create file browse dialog."; emit selectionCancelled(); return; } //set the selection filters if (m_filters.count() > 0) { char** ext = (char**)new char[m_filters.count()*sizeof(char*)]; int i = 0; for (QVariantList::iterator it = m_filters.begin(); it != m_filters.end(); ++it, ++i) { QString filter = it->toString(); if (!filter.trimmed().isEmpty()) { int length = (filter.length() + 1) * sizeof(char); ext[i] = new char[length]; strncpy(ext[i], filter.toAscii(), length); } } if (dialog_set_filebrowse_filter(m_dialog, (const char**)ext, m_filters.count()) != BPS_SUCCESS) { qDebug() << "unable to set file browse dialog extensions"; } for (i = 0; i < m_filters.count(); i++) { delete ext[i]; } delete ext; } if (dialog_show(m_dialog) != BPS_SUCCESS) { qDebug() << "Failed to show file browse dialog."; dialog_destroy(m_dialog); m_dialog = 0; emit selectionCancelled(); return; } bool shutdown = false; while (!shutdown) { bps_event_t* event = NULL; bps_get_event(&event, -1); // -1 means that the function waits // for an event before returning if (event) { if (bps_event_get_domain(event) == dialog_get_domain()) { //0=ok, 1=cancel int selectedIndex = dialog_event_get_selected_index(event); if (selectedIndex == 1) { int count; char** filepaths; if (BPS_SUCCESS == dialog_event_get_filebrowse_filepaths(event, &filepaths, &count)) { for (int i = 0; i < count; i++) { qDebug() << "selected file: " << filepaths[i]; m_filePaths.push_back(QString(filepaths[i])); } bps_free(filepaths); } emit selectionCompleted(); } else { emit selectionCancelled(); } qDebug() << "Got file browse dialog click"; shutdown = true; } } } if (m_dialog) { dialog_destroy(m_dialog); } }
This class derives from QObject (by QThread) which means that it can be used by QML when it exposes properties and signals. The FileBrowseDialog class has 3 properties
-multiple selection: a Boolean flag indicating if single or multiple selection is allowed
-filepaths: a read only value that returns the list of files selected
-Filters: a read/write value is where you can specify one or more filters to file (for example, ".doc", "*.jpg") etc.
The next part is how you call the FileBrowseDialog through the QML. To do this, we must inform the QML of the FileBrowseDialog page. This is done in the App class via the qmlregistertype code.
App.cpp
#include#include #include #include "app.hpp" #include "FileBrowseDialog.hpp" using namespace bb::cascades; App::App() { qmlRegisterType ("Dialog.FileBrowse", 1, 0, "FileBrowseDialog"); QmlDocument *qml = QmlDocument::create("main.qml"); qml->setContextProperty("cs", this); AbstractPane *root = qml->createRootNode (); Application::setScene(root); }
The QML is now ready to be able to use the FileBrowseDialog. The example below is a page complete qml which has a button and a label. When we click on the FileBrowseDialog button is open, and all selected files will appear in the label.
Main.QML
import bb.cascades 1.0
import Dialog.FileBrowse 1.0
Page {
content: Container {
Label { id: filebrowseDialogLabel }
Button {
text : "File Browse Dialog"
onClicked: {
filebrowseDialog.show();
}
}
attachedObjects: [
FileBrowseDialog {
id: filebrowseDialog
multiselect : true
filters : ["*.doc","*.jpg","*.txt"]
onSelectionCompleted: {
if(filebrowseDialog.filepaths.length>0)
filebrowseDialogLabel.text = filebrowseDialog.filepaths[0];
else
filebrowseDialogLabel.text = "no file selected";
}
onSelectionCancelled: {
filebrowseDialogLabel.text = "file browse dialog was cancelled";
}
}
]
}
}
And it's pretty much just invoke the native dialog file navigation in stunts. Please note save the file would follow a similar model, but I found that this dialog box was not particularly useful because it displays only a simple dialogbox with a text file name entry.
See you soon
Swann
Tags: BlackBerry Developers
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