I am using onMyLocationChangeLIstener with maps v2.
It works perfectly:
private void setUpMap() {
GoogleMap.OnMyLocationChangeListener myLocationChangeListener = new GoogleMap.OnMyLocationChangeListener() {
#Override
public void onMyLocationChange(Location location) {
LatLng loc = new LatLng(location.getLatitude(), location.getLongitude());
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(loc, 16.0f));
};
mMap.setOnMyLocationChangeListener(myLocationChangeListener);
}
When the activity is starting, the entire map is displayed and when the system finds my location, then shows the zoom marker on the map.
I want to display an "indeterminate progress bar" since the activity began, until it shows my location.
I've been reading about it, but I find a way to do it.
I appreciate any help.
Thanks and regards.
What about put a view on top of the map fragment? you can use FrameLayout to temporarly (it is bad for rendering otherwise) overlap a view with the indeterminate progress. When you receive the location change (your listener) you can check if the framelayout is showing (and if exists), and if so remove it.
Generally this is not recommended in google guidelines since the location could take minutes to hours to be retrieved (in indoor it can even be not found).
Related
I've run into a bit of an issue related to a whitelist Web Browser my company has been developing / maintaining for one of our product lines. The browser runs on top of Qt 4.8.6, using qtwebkit (Migration to 5.X would be ideal, but the embedded Linux OS we're using is too old to support the newer versions based on our testing, and upgrading to a newer OS is too costly to us / our customers). The primary interface to the browser is a 6x8 touchscreen, mounted inside an aircraft cockpit.
For sites that have things like scrollable/embedded maps (ex. Google Maps), the users of the browser want the ability to drag the entire page when they are selecting something outside of the map, and drag just the map (without the entire page scrolling) when the map is selected (Ala most of the popular mobile browsers).
Thus far, I am able to do one or the other, but not both:
When I hook mouse handlers into a QWebView or QGraphicsWebView, I can turn the cursor into a hand and very easily support dragging of the entire web page. However, that inhibits the page's ability to handle the mouse events for when a user is pulling over a map (i.e. When a user drags over a map, it drags the entire page without moving the map).
When I don't add in the hooks to handle mouse events, things like maps are scrollable by grapping/dragging them, but of course the user loses the ability to drag the entire page.
Right now, the browser uses the later, with scroll bars disabled and a directional-arrow overlay to allow the user to scroll the entire page (as the display size is limited, and scrollbars take up too much space when they are sized large enough for the user to interact with them)...but this is not ideal.
My Question: Is there any easy way to make it so that the page, and elements in a page, can be scrolled seamlessly?
Thanks!
Rob
Seems to me like you need to check if you are over such a map and ignore(pass along) the event in that case. I think you should be able to do something like this:
bool GraphicsWebView::isOverMap(QPoint pos) {
QWebPage* webPage = this->page();
if (webPage) {
QWebFrame* webFrame = webPage->frameAt(pos);
if (webFrame) {
QString selectorQuery = "#map-canvas"; // Based on https://developers.google.com/maps/tutorials/fundamentals/adding-a-google-map
QList<QWebElement> list = webFrame->findAllElements(selectorQuery).toList(); // Find all the maps!
foreach(QWebElement element, list) {
if (element.geometry().contains(pos)) {
return true; // Cursor is over a map
}
}
}
}
return false; // No match
}
Obviously this is a pretty specific function but there is probably a way to come up with a better selector query that will apply to all those kinds of QWebElement.
Assuming you hook mouse events by subclassing QGraphicsWebView and reimplementing void mouseMoveEvent(QGraphicsSceneMouseEvent * event), I suggest you do something like:
void GraphicsWebView::mouseMoveEvent(QGraphicsSceneMouseEvent* event) {
if (isOverMap(mapFromScene(event->scenePos()).toPoint())) { // We got a map!
event.ignore(); // Clear the accept flag
return; // Return, we're done here
}
handleMoveView(); // Not over any maps, let's scroll the page
}
This part of the doc explains how events are handled with regard to the topmost item. I especially recommend you read the third paragraph.
Hope that helps!
EDIT: Did a bit more research and it looks like something like that could be more generic:
graphicsView.focusItem()->flags().testFlag(QGraphicsItem::ItemIsMovable);
It's at the very least worth investigating as a replacement to isOverMap()
EDIT: Gotcha, here is something you can try then.
Start by subclassing QGraphicsSceneMouseEvent and add a signal called void destroyedWithoutAccept() that's emitted in the destructor if the event has not been accepted.
Then modify mouseMoveEvent to look like this:
void GraphicsWebView::mouseMoveEvent(QGraphicsSceneMouseEvent* event) {
MyEvent myEvent = new MyEvent(event); // Copy event
event.accept(); // accept original event
connect(myEvent, SIGNAL(destroyedWithoutAccept),
this, SLOT(handleMoveView)); // Callback if unused
QGraphicsWebView::mouseMoveEvent(myEvent); // Pass it to Base class
}
If that works, it might introduce a bit of delay if deleteLater is used to destroy it. But in that case reimplement it as well.
I'm selecting and loading some big Dicom files on my program. The whole loading process takes a long time(depends on the number of files, but the whole process can take more than minutes if the files are many). I want show a "waiting symbol" or something like that when the file uploading is going on. I searched for it, but I didn't get anything definite.
My code for the selection and uploading part is as below:
void MainWindow::showTheSelectedList()
{
QFileDialog * fileDialog = new QFileDialog(this);
fileDialog->setFileMode(QFileDialog::ExistingFiles);
QListView* list = fileDialog->findChild<QListView*>("listView");
if(list)
{
list->setSelectionMode(QAbstractItemView::MultiSelection);
}
QTreeView* tree = fileDialog->findChild<QTreeView*>();
if(tree)
{
tree->setSelectionMode(QAbstractItemView::MultiSelection);
}
if(fileDialog->exec())
{
if(fileDialog->selectedFiles().size()>0)
{
int listsize=stringList.size();
for(int i=0;i<listsize;i++)
{
// get the name of the file
// check if the file is dicom
// upload if the file is dicom
// after uploading, get the pixel data of that file
// use the pixel data and make a icon out of it
//then insert the icon in an a QTablewView
}
}
}
//show the QtableView
}
Could you please instruct me where and how I can show the waiting sign or symbol while the uploading part is running?
Thanks
I think you are looking for the QProgressBar class. The documentation makes it clear below. You will need to set up the minimum and maximum values, and it will do the job for you.
The QProgressBar widget provides a horizontal or vertical progress bar.
A progress bar is used to give the user an indication of the progress of an operation and to reassure them that the application is still running.
The progress bar uses the concept of steps. You set it up by specifying the minimum and maximum possible step values, and it will display the percentage of steps that have been completed when you later give it the current step value. The percentage is calculated by dividing the progress (value() - minimum()) divided by maximum() - minimum().
You can specify the minimum and maximum number of steps with setMinimum() and setMaximum. The current number of steps is set with setValue(). The progress bar can be rewound to the beginning with reset().
If minimum and maximum both are set to 0, the bar shows a busy indicator instead of a percentage of steps. This is useful, for example, when using QNetworkAccessManager to download items when they are unable to determine the size of the item being downloaded.
I do not think much more details can be provided based on the question as the worker loop seems to be commented without actual code being provided in there, but this documentation should make it clear either way.
Note that I would personally even move the worker loop into an own worker thread if it is that hefty that it deserves a progressbar. As for the progressbar, you would probably write something like this:
QProgressBar bar(this);
bar.setRange(maximum, maximum);
bar.setValue(minimum);
bar.show();
Dialog box:
My novice suggestion would be to use progress bar inside your for loop and increment the progress bar as each file finishes loading.
Let me know if you need more detail.
I have this code, which works fine if a cell in the IgGrid control is being edited:
var verticalContainer = $("#BookLabor_scrollContainer");
var topPos = verticalContainer.scrollTop();
$("#BookLabor").igGrid("option", "dataSource", blankLaborDS);
$('#BookLabor').igGrid('dataBind');
verticalContainer.scrollTop(topPos);
However, when I use an IgDialog that I have pop open on a grid cell with a button click event, this is not scrolling back to the row being edited:
var verticalContainer = $("#BookLabor_scrollContainer");
var topPos = verticalContainer.scrollTop();
$("#BookLabor").igGrid("option", "dataSource", blankLaborDS);
$('#BookLabor').igGrid('dataBind');
verticalContainer.scrollTop(topPos);
There is a virtual scroll method for the IgGrid, but the online documentation does not explain in detail how to use it.
Any tricks, tips, hints from all you Infragistics experts out there?
The scroll related API is very basic and what you are using is pretty much comparable:
.igGrid("scrollContainer") is merely a shorthand so you don't have to use #BookLabor_scrollContainer (it's an internal id)
.igGrid("virtualScrollTo", scrollContainerTop); is just like scroll top when you are using virtual scrolling, which you might be (can't tell without more code) so you might want to try that out.
HOWEVER, is there a reason to call dataBind after cell edit? ( I'm having a hard time finding a scenario for that). It is not intended by any means and it creates a lot of overhead with bigger data. If you need to update cell values you should be using the Updating API that does not require re-bind and will not require scroll after as well..see:
http://help.infragistics.com/jQuery/2012.2/ui.iggridupdating#methods
As for the dialog, the Updating again provides a row template that internally uses the dialog and I highly recommend that if row editing is acceptable. Sample:
http://www.infragistics.com/products/jquery/sample/grid/row-edit-template
I was studying the Model-View-Controller design pattern and i understand the concept behind the pattern theorotically, but I wanted to get a peek at how one would actually put it to practice.
Wikipedia mentions Wt - Web toolkit, CppCMS and some other standard implementations which use the pattern however I have not been familiar with these, and I was just hoping and
will be really grateful If anyone can provide some sample code(hopefully C++) which implements the pattern and explains the theory of the pattern being put to practice.
Here's a quick example I made (didn't try compiling it, let me know if there's errors):
class Button; // Prewritten GUI element
class GraphGUI {
public:
GraphGUI() {
_button = new Button("Click Me");
_model = new GraphData();
_controller = new GraphController(_model, _button);
}
~GraphGUI() {
delete _button;
delete _model;
delete _controller;
}
drawGraph() {
// Use model's data to draw the graph somehow
}
...
private:
Button* _button;
GraphData* _model;
GraphController* _controller;
};
class GraphData {
public:
GraphData() {
_number = 10;
}
void increaseNumber() {
_number += 10;
}
const int getNumber() { return _number; }
private:
int _number;
};
class GraphController {
public:
GraphController(GraphData* model, Button* button) {
__model = model;
__button = button;
__button->setClickHandler(this, &onButtonClicked);
}
void onButtonClicked() {
__model->increaseNumber();
}
private:
// Don't handle memory
GraphData* __model;
Button* __button;
};
Ignoring the implementation of Button, basically this program will use GraphGUI to display a graph that will change when a button is pressed. Let's say it's a bar graph and it will get taller.
Since the model is independent of the view (the button), and the controller handles the communication between the two, this follows the MVC pattern.
When the button is clicked, the controller modifies the model via the onButtonClicked function, which the Button class knows to call when it is clicked.
The beauty of this is since the model and view are completely independent, the implementation of each can drastically change and it won't affect the other, the controller might simply have to make a few changes. If the model in this case calculated some result based off some database data, then clicking the button could cause this to happen, but the button implementation wouldn't have to change. Or, instead of telling the controller when a click occurs, maybe it can tell the controller when the button is moused-over. The same changes are applied to model, regardless of what triggered the changes.
A simple text editor could be designed based on MVC. Think of the string class as the model, where data is stored. We might have a class called SimpleTextView which displays the text in the string attached to it, as it is. A class called KeyboardEventHandler can act as the controller. The controller will notify the view about new keyboard events. The view in turn modifies the model (like appending or removing text). The changes in the model is reflected on all views attached to it. For instance, there might be another view called HtmlView attached to the string object manipulated from within the SimpleTextView. If the user enters valid HTML tags in the SimpleTextView, the HtmlView will display the formatted output - real-time.
There are couple of complete MVC examples, plus discussion, in ch 2 of an introduction to programming in Python 3.x that I wrote (I've not completed ch 3 etc., that project's been on ice for some time -- Python community really like angry swarm of bees when discovered I'd written that Python was perhaps not suitable for very large scale development, so it became difficult to get sensible feedback). It's available in PDF format from Google Docs. I don't know how well it maps to common MVC implementations, I was mostly concerned with getting the general idea across. :-)
Cheers & hth.,
PS: There's a nice table of contents in the PDF file but Google Docs doesn't show it. You'd need to dl and use Foxit or Acrobat or some other PDF viewer. I think there's a separate viewable TOC at Google Docs, though, haven't checked and don't remember whether updated.
PPS: Forgot to mention, the MVC image processing example near the end has nice pic of Lena Söderberg! :)
Code is the best approach to understand and learn Model View Controller:
Here is a simple JS example (from Wiki)
/** Model, View, Controller */
var M = {}, V = {}, C = {};
/** Model stores data */
M.data = "hello world";
/** View controls what to present */
V.render = (M) => { alert(M.data); }
/** Controller bridges View and Model */
C.handleOnload = () => { V.render(M); }
/** Controller on Windows OnLoad event */
window.onload = C.handleOnload;
Here is a detailed post in C/C++
Model-View-Controller Explained in C++
We're using Infragistics grid (most probably, we'll have 8.2 version at the end) and we want to configure row/cells appearances "on-demand" in order to be able to provide sort of "dynamic appearance".
For example, I want some cell to be red or green, depending on its value. We might want to tweak other characteristics as well (font, size, image, etc).
A perfect place to do it would be some event, that happen before a cell gets repainted... But it seems there is no such event in Infragistics...
Or am I wrong? Any help?
Clarification: I'm talking about WinForms Infragistics UltraGrid
I had to do exactly this with the IG WebGrid a few years back, and it was ... shall we say ... painful. However, the WebGrid had the advantage of a single render point -- once the HTML was emitted, we were set!
For dealing with this in WinGrid, I tried a variety of different events, both on the grid and the datasource, and met with abject failure every step of the way. The only event I got to work was Paint, which will likely create a performance issue.
For Paint, here's what I hacked together. I'm not proud of this code, and I likely wouldn't put it in production, but here it is anyway (C#):
private void UltraGrid1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
foreach (UltraGridRow r in UltraGrid1.Rows)
{
foreach (UltraGridCell c in r.Cells)
{
if (c.Text == "foo")
c.Appearance.BackColor = Color.Green;
}
}
}
and VB:
Private Sub UltraGrid1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles UltraGrid1.Paint
For Each r As UltraGridRow In UltraGrid1.Rows
For Each c As UltraGridCell In r.Cells
If c.Text = "foo" Then
c.Appearance.BackColor = Color.Green
End If
Next
Next
End Sub
There is an event. I don't remember exactly what it's called, but it's got to be something like 'DataRowBound' or 'ItemDataBinding', etc..
Also, this article might help.
Not that this has anything to do with your question, but I'd stay away from heavy use of Infragistics controls - they're very heavy and will slow down the page rendering process considerably. Just my $0.02.
We have finally come up with two solutions for that problem.
For some of the dynamic content we use grid elements appearance and reinitialize it "on-demand".
For the extremely resource-critical appearance we use UltraGrid.DrawFilter (see also IUIElementDrawFilter interface).