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Дабы текст не "гулял" в силу своего размера по окну просмотрщика, заодно проблема с автовыделением текста поправлена:

diff --git a/wlx/fileinfo/fileinfo.c b/wlx/fileinfo/fileinfo.c
old mode 100644
new mode 100755
index 55f6721..acf6535
--- a/wlx/fileinfo/fileinfo.c
+++ b/wlx/fileinfo/fileinfo.c
@@ -83,6 +83,7 @@ HANDLE DCPCALL ListLoad (HANDLE ParentWin, char* FileToLoad, int ShowFlags)
 	gtk_container_add (GTK_CONTAINER (scroll), vp);
 	gtk_widget_show (vp);
 */	label = gtk_label_new(NULL);
+	gtk_misc_set_alignment(GTK_MISC(label), 0, 0);
         gtk_label_set_selectable (GTK_LABEL(label), TRUE);
 	gtk_label_set_line_wrap(GTK_LABEL(label), FALSE);
         gtk_widget_modify_font (label, pango_font_description_from_string ("Monospace 11"));
@@ -93,6 +94,7 @@ HANDLE DCPCALL ListLoad (HANDLE ParentWin, char* FileToLoad, int ShowFlags)
         gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scroll),
                                   GTK_POLICY_AUTOMATIC,
                                   GTK_POLICY_AUTOMATIC);
+	gtk_widget_grab_focus(scroll);
 	gtk_widget_show (label);
 	free(buf1);
 /*--------------------------------------*/

Автор: j2969719
На форуме отсюда и далее.

Hi anyone...

I found this repo, with some code for generating a PDF preview plugin for DC.

I just compile it with:

make

Dependences are: (ubuntu machine)

sudo apt-get install build-essential libgtk2.0-dev libpoppler-glib-dev

any direction or attention to it, It's apreciated.

Because it's an important feature for a file manager on linux, specially for GNOME and XFCE desktops.

before
execl("/usr/bin/fileinfo.sh", "fileinfo.sh", FileToLoad, 0);
after
execlp("/home/user/.config/doublecmd/fileinfo.sh", "fileinfo.sh", FileToLoad, 0);

Hi Christian,
Thank you for the plugin. It was required for DC as it was for TC. We're still waiting for the same TC for Linux. You changed the name from WC to TC for this purpose. You remember?
Anyway, I experienced a problem with the plugin when packing a name containing colon. It locates at the root when opening the lst file with DC. As well, what you see is the remainder of the name (the portion after colon). For example if you have:
a/b:c.obj
you'll get:
/c.obj

I've checked sourcecode of wlx plugins here, and see they are quite easy to write even without installing Lazarus. So I decided to finally implement QuickLook.

It can be created using QLPreviewView as follows (obj-c):

NSView* myView = something(ParentWin);  // don't know how
CGRect frame = myView.bounds; // get frame (position and size), maybe add inset
QLPreviewView* qlview = [[QLPreviewView alloc] initWithFrame:frame style:QLPreviewViewStyleNormal];
[qlview setPreviewItem:item];    // item is descriptor
[myView addSubview: qlview];  // myView is parent window

item is objective-c object conforming to QLPreviewItem protocol. (It can be any object implementing required @property(readonly) NSURL *previewItemURL property and possibly optional @property(readonly) NSString *previewItemTitle property)

That's all.

But the problem here is how to convert HWND to proper myView handle.

Any ideas?