So I have this project in which I need to have few tabs (TPageControl) with flash pages running and grab a screenshot of them from time to time without switching active tab.
First I tried TChromiumOSR but the flash is not visible in it, kind of works if I click on a page's button that opens a popup with flash maximized. so it doesn't look like a problem with flash but rather with frames or sth. anywas a no-go.
then I've tried TChromium, everything works alright but I don't know how to grab a screenshot of a control that is on non-active TTabSheet without switching tabs.
using latest dcef3 trunk
any ideas? thanks
edit: It turned out that flash not being visible in OSR is an old chromium bug. It's actually playing but not visible if embedding code has "wmode" set to something else than 'transparent'. I've managed to change that property through js. To actually see the change, flash object needs to be removed from DOM and added again:
chr1.browser.GetFrame(str[i]).ExecuteJavaScript('document.getElementsByName("wmode")[0].value="transparent";', '', 0);
chr1.browser.GetFrame(str[i]).ExecuteJavaScript('document.getElementsByName("wmode")[1].value="transparent";', '', 0);
chr1.browser.GetFrame(str[i]).ExecuteJavaScript('var wtf = document.getElementById("gameApp2");', '', 0);
chr1.browser.GetFrame(str[i]).ExecuteJavaScript('document.getElementById("gameApp2").remove();', '', 0);
chr1.browser.GetFrame(str[i]).ExecuteJavaScript('document.body.appendChild(wtf);', '', 0);
If the tab is not being shown (it's not the front one), it doesn't get drawn (this is an operating system thing). If it's not being drawn, there's nothing there for a screenshot to capture.
If your requirement is to capture a Flash page without it being displayed, you're going to have to find another way to do it.
Assuming your Chrome is still based on WebKit, I know WebKitGTK has its own snapshot engine, if it carries down deep enough, perhaps you can tap into that for your captures.
At one point, there was a behavioural issue with TPageControl that until a tab had been selected, none of its children had valid handles created. I do not know if that is still the case, but if it is, it may complicate your desire to not switch tabs.
Assuming the control HAS a valid window handle, you might create a TBITMAP, lock its canvas, grab the Canvas's handle (DC) and fake a WM_PAINT to the control to get it to render to your bitmap.
Related
I'm trying to activate Hint from control of different application created from delphi upon focus, I'm using hook to identify the focused control, and then use WM_MOUSEMOVE, which I think will activate the Hint of that control, the handle would be the Control itself and the lParam is the Left and Top of the Control. The Control activate the OnMouseMove Event, but the Hint never shows. but when I use SetCursorPos, Hint show, but I need to show the Hint with out the cursor move on that Control. Can you please help me with this? Thank you in advance... by the way I'm using Delphi XE4
Among the really asked question is how to show the hint of a control that resides on another application (i am afraid without hook that application can not be done), the title is "Delphi - Activating the Hint from another control of Application".
First is first: That can be done without knowing what language the other app was done, but it is very complex to put it here (and i am not an expert on such way of coding, also i hate apps that work that way).
Second: The main idea is to hook the other application, search on Google some code of that apps, that can show you a rectangular hole square of the object the mouse is passing over, that application while doing it is iconized (i do not remember the name of it).
Waht such app does: As you move the mouse over the screen it overlays a rectangular over the control that mouse is over, then if you press the key to print screen, that small region is the only thing that goes to clipboard; on of such apps i saw had an extra funcion, they can move such controls if you press cursors on keyboard, also can hide/enable/disable such control... more, it can also make controls that are invisible to be visible, etc... i saw it working on my computer, and hey, for fun it is pretty and to DeBug or get extra things on some apps is also great (make some menús to be visible and enabled and then can use such funtions).
Please, please, understand i am agaist piracy and also against using such apps to let code to be run... some apps need pay for letting some menus enabled, but they have the code there, no need to change EXE to have/use that menus; just using this kind of apps makes that limited apps to be unlimited (just enable or show hidden menus and voila).
Note: To unhide menus, mouse point is not needed to be over the app, can be anywhere and is not moved.
The idea i want to say is: Any app can move, alter any control on any other app (at least on Windows) that is running, so maybe there can be a way to show such hint.
In the past i had use such app (sorry i do not remember the name) for DeBug my own apps, so i do not need to recompile in such cases where something was wrongly hidden, also work with buttons, labels, texts, combos, memos, etc.
Now my small problem is: I just need exactly what title say, but i can not make it to work.
Must be:
Mouse position must be irrelevant (it also must be able to be outside the application)
Just when a button that has focus is pressed with keyboard (Space or Enter) or just after some code somewhere on my application, i want to show the Hint of a specific TEdit for a short period of time.
I did not get Hint to be shown; not unless mouse point is over such TEdit but i want/need mouse pointer to not be over it, neither it to jump to the TEdit.
Idea Conept for that Hint to be shown: After doing some code that changes something, show extra info associated.
Example:
A button with that loads a file using an open dialog, filename is put on a ReadOnly TEdit (so it let user copy the text, but not change it); i want extra info that i punt on .Hint of such TEdit to be shown inmediatly.
That hint use is for not overload window with a lot of fields (TLabels) for showing such file data.
Simple idea: such Hint shows TimeStamp and size of the selected file.
P.D.: Not much related (since i am trying with a normal plain text hint), but hints can also store a full HTML page and with 3rd party tools be shown as an HTMLhint, so they can show a lot info of that file (also its content, etc) in a web based format; as i say i first try with standard plain text hints.
In order to show hint programatically you need to call TApplications ActivateHint method to which you specify the position parameter.
http://docwiki.embarcadero.com/Libraries/XE3/en/Vcl.Forms.TApplication.ActivateHint
Based on position parameter Application automatically finds which controll is at that position and shows its hint.
NOTE: Position parameter screen coordinates in pixels and not your controll coordinates. So you will have to use ClientToScreen method to change your coordinates apropriately.
You can see simple example of how to use this here: https://stackoverflow.com/a/15031208/3636228
Now if you need to do this from another application then you will have to add some comunication mechanizm to these two application so that one could send a proper message to tell the other to show the hint at specific position. But this does require you to be able to change both applications.
EDIT: This works with VCL applications but I'm not sure if it would work with FireMonkey applications.
It not just my curiosity, recently I've received a bugreport concerning one of my AS3 applications. This bug can be reproduced only if the quality in flash player is set to LOW (HIGH/MEDIUM - everything is ok). The bug changes the application behaviour, but it's a mystery for me, why it happens only for LOW quality while quality is said to influence rendering and visual appearance, not the code or behaviour.
Briefly, I have a menu panel (MovieClip) with several items (also MovieClips). Very simple, it appears on a screen after a MouseEvent and a user moves a cursor from one element down to another. When the cursor reaches the edge of the second item, the menu suddenly disappears.
In my code panel hiding is set on mouse click or mouse out.
Personally, I think, that the problem is in Tweener, I have to use that old piece of code. The menu panel is shown when mouse is above a user icon, and concurrently with the help of Tweener I produce some simple effects on this icon.
I have explored adobe and firefox (my app is for web browsers and the bug is reported for firefox) bugtrackers, but so far I have found nothing. Maybe misbehaviour of flash player 11 with Arrays, already fixed... I've run out of ideas.
From the docs:
LOW
Specifies low rendering quality: graphics are not anti-aliased, and bitmaps are not smoothed.
If it only happens when rendering it set to low, then it's probably a timing issue - i.e., the bug has always been there, but because you're wrapping up rendering earlier, you can trigger then bug. Is the bug reporter's computer a slow one? Is there a lot happening at once? Is the menu being removed, set to invisible, or repositioned?
Like #jeremynealbrown said, try and separate out your class to a simple project to make sure there's nothing wrong with your logic there.
Another method, override the removeChild() method, and visible and x and y properties to see which one is setting it, then put traces before all calls that call these to see what's triggering it.
If you think the problem is in Tweener, add a MOUSE_OVER listener to the menu panel that calls something like removeAllTweens(), no matter the state of the menu panel. If the bug doesn't happen anymore, this will show you that it's related to the tween engine.
I am using the new BrowserField2 in BlackBerry OS5 to display HTML content in my app. There are 3 options available for navigation through links in that content.
CURSOR navigation uses a block cursor and actually moves through the characters of the page. Not very useful for me.
POINTER navigation uses a mouse like pointer that you move around the screen and hover over elements. This could work but there is a bug however in that the browser field captures navigation and never lets go so this mode is effectively broken if you share a screen with any other managers. Once your focus enters the browser field you cannot move focus back out and into neighboring fields. RIM has acknowledged the bug but has no work around.
NONE which is for custom navigation but they offer no explanation as to how you would do this.
What I ideally want is to simply have trackpad movements move the focus through the links and highlight them. Then a click would activate the link. I assume I would select the NONE option above and implement my own focus navigation but I am not clear how this can be accomplished with the new APIs.
Is anyone familiar with the new browser2 component could give some guidance?
Thanks!
There's a workaroudn to getting back the focus out of the BrowserField using the NAVIGATION_POINTER.
I found it in this thread:
http://supportforums.blackberry.com/t5/Java-Development/BrowserField-2-Navigation-Mode/td-p/632172
"farahh" posted this:
I found out a hack..
with the navigation set to pointer mode, a click outside the browserfield manager invokes Manager.invokeAction(int). I used the getFieldWithFocus to verify which field has focus and then switch the focus to something else.
Cheers.
Nahuel
PD: i havent found out how to get the behaviour you want, i need that as well so if you got it working please let me know, its kinda urgent in my project =(
I actually reverted back to the older browser1 (OS4) component because the navigation problems in browserField2 (OS5) were a deal breaker for me. Luckily the OS4 browser does everything I need in terms of functionality and it has the exact navigation behavior I need and there are no focus problems mixing it with other views.
Windows in my application are popping up off the edge of the screen, and this of course is a problem because some of the windows are modal and can't be dismissed (you don't even know they are there).
I'm using the TurboPower Orpheus component which remembers the location and size of each form, then restores it when the form is shown again. It saves the size and placement in an INI file.
What can I do to prevent windows from ever showing off the side of the screen?
It's common for this sort of thing to happen if you use multiple monitors and then disconnect one, such as when undocking a laptop. Or if you dock a laptop to a screen with a higher resolution. Or use remote desktop, etc..
The remedy is to override the "remember my position" behavior with a sanity check, to see if the left+width exceeds the width of the screen (Screen.Monitors array, actually - thanks guys), and vice-versa for the top+height.
Ideally, you "bump" by subtracting the difference, so you're butting up against the edge that the window wanted to straddle.
Also, see if there are updates to Orpheus that fix this. If not, you can get the source, make the correction (optional), and contribute it back to the project. It's OSS, as I recall.
You may want to give a look at their DefaultMonitor property and read the code from TCustomForm.SetWindowToMonitor to see how to deal with positioning relatively to Screen.Monitors.
Use DefaultMonitor to associate a form with a particular monitor in a multi-monitor application. The following table lists the possible values:
Value Meaning
dmDesktop No attempt is made to position the form on a specific monitor.
dmPrimary The form is positioned on the first monitor listed in the global screen object's Monitors property.
dmMainForm The form appears on the same monitor as the application's main form.
dmActiveForm The form appears on the same monitor as the currently active form.
Note: DefaultMonitor has no effect if the application does not have a main form.
To recall the previous position of a form, without having it suddenly in an area which is no longer available (due to a plugged off screen or changed resolution), you just call
TForm.MakeFullyVisible;
That's it. See the documentation.
I'm trying to draw over the whole screen by using the desktop canvas and painting to it directly. The problem is I can't clear that desktop canvas. I've tried setting the canvas.pen.style to psNotXOR and draw over the old image but unfortunately, this is not reliable enough and some left overs are still present in some conditions.
My need is to draw a selection rectangle around a window / control when the mouse is over it.
You don't write on what OS you have problems with the artefacts after clearing.
At least with desktop composition activated it is a very bad idea to draw directly to the desktop and to do XOR painting (see "Drawing To and Reading From the Screen -- Baaaad!" in this blog post). Apart from the negative performance implications you can't be sure what other painting happens at the same time and what effects and animations alter the displayed content, so a simple XOR may not be enough to completely erase everything.
One possible way to implement it would be a transparent overlay window of desktop size, and to draw your rubber band selector over that. Invalidating the whole window if the size changes should be enough, no need to erase the old selection line. If the overlay is removed the line will be gone too. Desktop composition will make sure that no flicker occurs. However, switching applications while selecting an area will be problematic, you need to catch this and immediately cancel the selection.
Edit:
I just tested it with Delphi 2009, and with the following test app:
a form with FormStyle set to fsStayOnTop and with AlphaBlend set to True
with an overridden CreateParams() method to add the WS_EX_TRANSPARENT extended style flag
I can pass all mouse clicks through to the underlying windows while being able to draw into a window on top of them. This should get you started.
I've done some stuff like this in the past and I've never come up with an acceptable solution.
Having a think about it though you could send the desktop HWND an invalidate command.
Because the desktop is a modified listview control you should able to use something like
procedure InvalidateDesktop;
begin
RedrawWindow(GetDesktopWindow, 0, 0, RDW_INVALIDATE);
//if that doesn't work then try this:
//Sendmessage(GetDesktopWindow, wm_setredraw, 1, 0);
end;
That might do what you want, I haven't tested it as I've just knocked it up for the example.
the problem is that Windows won't return me the control behind the mouse
I think you need to hook the mouse event messages for this - the hooked message then gives you the window handle that the mouse is over.
Look up SetWindowsHookEx(WH_MOUSE,,,) and MOUSEHOOKSTRUCT.
This is how we do it in our app:
FBitmap.Canvas.Brush.Color := clWhite;
FBitmap.Canvas.FillRect(FBitmap.Canvas.ClipRect);