Question: Resize windows width to 1/3 of screen

[pavelpromin]

I'm sorry, I'm not programmer and I don't understand C
I need resize windows to 1/3 of screen by width. How can i do it?
Is it lines 566-579 code block of hooks.c file?

[stefansundin]

Hi. Sorry for late response.

For the Aero Snap behavior, the lines you need to modify is here:

altdrag/hooks.c

Lines 739 to 859 in d433373

	if (sharedsettings.Aero) {
	// Restore window?
	if (maximized
	&& ((pt.y >= mon.top+AERO_THRESHOLD)
	|| (fmon.left < pt.x && pt.x < mon.left+2*AERO_THRESHOLD)
	|| (mon.right-2*AERO_THRESHOLD < pt.x && pt.x < fmon.right))) {
	// Restore window
	WINDOWPLACEMENT wndpl = { sizeof(WINDOWPLACEMENT) };
	GetWindowPlacement(state.hwnd, &wndpl);
	wndpl.showCmd = SW_RESTORE;
	SetWindowPlacement(state.hwnd, &wndpl);
	// Update wndwidth and wndheight
	wndwidth = wndpl.rcNormalPosition.right-wndpl.rcNormalPosition.left;
	wndheight = wndpl.rcNormalPosition.bottom-wndpl.rcNormalPosition.top;
	}
	// Move window
	if (pt.x < mon.left+2*AERO_THRESHOLD && pt.y < mon.top+2*AERO_THRESHOLD) {
	// Top left
	state.wndentry->restore = 1;
	wndwidth = (mon.right-mon.left)/2;
	wndheight = (mon.bottom-mon.top)/2;
	posx = mon.left;
	posy = mon.top;
	}
	else if (mon.right-2*AERO_THRESHOLD < pt.x && pt.y < mon.top+2*AERO_THRESHOLD) {
	// Top right
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left)/2, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = (mon.bottom-mon.top)/2;
	posx = mon.right-wndwidth;
	posy = mon.top;
	}
	else if (pt.x < mon.left+2*AERO_THRESHOLD && mon.bottom-2*AERO_THRESHOLD < pt.y) {
	// Bottom left
	state.wndentry->restore = 1;
	wndwidth = (mon.right-mon.left)/2;
	wndheight = max(min((mon.bottom-mon.top)/2, state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left;
	posy = mon.bottom-wndheight;
	}
	else if (mon.right-2*AERO_THRESHOLD < pt.x && mon.bottom-2*AERO_THRESHOLD < pt.y) {
	// Bottom right
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left)/2, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top)/2, state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.right-wndwidth;
	posy = mon.bottom-wndheight;
	}
	else if (pt.y < mon.top+AERO_THRESHOLD && !state.mdiclient) {
	// Top
	if (!maximized) {
	state.wndentry->restore = 0;
	// Center window on monitor and maximize it
	WINDOWPLACEMENT wndpl = { sizeof(WINDOWPLACEMENT) };
	GetWindowPlacement(state.hwnd, &wndpl);
	wndpl.rcNormalPosition.left = fmon.left+(mon.right-mon.left)/2-state.origin.width/2;
	wndpl.rcNormalPosition.top = fmon.top+(mon.bottom-mon.top)/2-state.origin.height/2;
	wndpl.rcNormalPosition.right = wndpl.rcNormalPosition.left+state.origin.width;
	wndpl.rcNormalPosition.bottom = wndpl.rcNormalPosition.top+state.origin.height;
	wndpl.showCmd = SW_MAXIMIZE;
	SetWindowPlacement(state.hwnd, &wndpl);
	}
	return;
	}
	else if (pt.y < mon.top+2*AERO_THRESHOLD) {
	// Top
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left), state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = (mon.bottom-mon.top)/2;
	posx = mon.left+(mon.right-mon.left)/2-wndwidth/2; // Center horizontally (if window has a max width)
	posy = mon.top;
	}
	else if (mon.bottom-AERO_THRESHOLD < pt.y) {
	// Bottom
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left), state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top)/2, state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left+(mon.right-mon.left)/2-wndwidth/2; // Center horizontally (if window has a max width)
	posy = mon.bottom-wndheight;
	}
	else if (pt.x < mon.left+AERO_THRESHOLD) {
	// Left
	state.wndentry->restore = 1;
	wndwidth = (mon.right-mon.left)/2;
	wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left;
	posy = mon.top+(mon.bottom-mon.top)/2-wndheight/2; // Center vertically (if window has a max height)
	}
	else if (mon.right-AERO_THRESHOLD < pt.x) {
	// Right
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left)/2, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.right-wndwidth;
	posy = mon.top+(mon.bottom-mon.top)/2-wndheight/2; // Center vertically (if window has a max height)
	}
	else if (state.wndentry->restore) {
	// Restore original window size
	state.wndentry->restore = 0;
	wndwidth = state.origin.width;
	wndheight = state.origin.height;
	}
	// Aero-move the window?
	if (state.wndentry->restore) {
	state.wndentry->width = state.origin.width;
	state.wndentry->height = state.origin.height;
	// Move
	MoveWindow(state.hwnd, posx, posy, wndwidth, wndheight, TRUE);
	// Get new size after move
	// Doing this since wndwidth and wndheight might be wrong if the window is resized in chunks
	GetWindowRect(state.hwnd, &wnd);
	state.wndentry->last.width = wnd.right-wnd.left;
	state.wndentry->last.height = wnd.bottom-wnd.top;
	// We are done
	return;
	}

For resize double-click, you can change these lines:

altdrag/hooks.c

Lines 1755 to 1800 in d433373

	if (GetTickCount()-state.clicktime <= GetDoubleClickTime()) {
	sharedstate.action = ACTION_NONE; // Stop resize action
	state.clicktime = 0; // Reset double-click time
	state.blockmouseup = 1; // Block the mouseup, otherwise it can trigger a context menu (e.g. in explorer, or on the desktop)
	// Get and set new position
	int posx, posy, wndwidth, wndheight;
	wndwidth = max(min((mon.right-mon.left)/2, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top)/2, state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left;
	posy = mon.top;
	if (state.resize.y == RESIZE_CENTER) {
	wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posy += (mon.bottom-mon.top)/2-wndheight/2;
	}
	else if (state.resize.y == RESIZE_BOTTOM) {
	posy = mon.bottom-wndheight;
	}
	if (state.resize.x == RESIZE_CENTER && state.resize.y != RESIZE_CENTER) {
	wndwidth = max(min((mon.right-mon.left), state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	posx += (mon.right-mon.left)/2-wndwidth/2;
	}
	else if (state.resize.x == RESIZE_CENTER) {
	wndwidth = wnd.right-wnd.left;
	posx = wnd.left-mdiclientpt.x;
	}
	else if (state.resize.x == RESIZE_RIGHT) {
	posx = mon.right-wndwidth;
	}
	MoveWindow(state.hwnd, posx, posy, wndwidth, wndheight, TRUE);
	// Get new size after move
	// Doing this since wndwidth and wndheight might be wrong if the window is resized in chunks (e.g. PuTTY)
	GetWindowRect(state.hwnd, &wnd);
	// Update wndentry
	state.wndentry->last.width = wnd.right-wnd.left;
	state.wndentry->last.height = wnd.bottom-wnd.top;
	if (!state.wndentry->restore) {
	state.wndentry->width = state.origin.width;
	state.wndentry->height = state.origin.height;
	state.wndentry->restore = 1;
	}
	// Prevent mousedown from propagating
	return 1;
	}

Good luck!

P.S. If you fork the project and commit your changes to your fork, then we can easily see your modifications. In case anyone else wants this too.

[pavelpromin]

Thank you!
I just modify some strings for splitting widescreen lcd view to 3 part:

altdrag/hooks.c

Lines 813 to 818 in d433373

	// Bottom
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left), state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top)/2, state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left+(mon.right-mon.left)/2-wndwidth/2; // Center horizontally (if window has a max width)
	posy = mon.bottom-wndheight;

to

// Bottom
state.wndentry->restore = 1;
wndwidth = max(min((mon.right-mon.left)/3, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
posx = mon.right-2*wndwidth;
posy = mon.top+(mon.bottom-mon.top)/3-wndheight/3;

altdrag/hooks.c

Lines 821 to 826 in d433373

	// Left
	state.wndentry->restore = 1;
	wndwidth = (mon.right-mon.left)/2;
	wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.left;
	posy = mon.top+(mon.bottom-mon.top)/2-wndheight/2; // Center vertically (if window has a max height)

to

// Left
state.wndentry->restore = 1;
wndwidth = (mon.right-mon.left)/3;
wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
posx = mon.left;
posy = mon.top+(mon.bottom-mon.top)/3-wndheight/3;

altdrag/hooks.c

Lines 829 to 834 in d433373

	// Right
	state.wndentry->restore = 1;
	wndwidth = max(min((mon.right-mon.left)/2, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
	wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
	posx = mon.right-wndwidth;
	posy = mon.top+(mon.bottom-mon.top)/2-wndheight/2; // Center vertically (if window has a max height)

to

// Right
state.wndentry->restore = 1;
wndwidth = max(min((mon.right-mon.left)/3, state.mmi.ptMaxTrackSize.x), state.mmi.ptMinTrackSize.x);
wndheight = max(min((mon.bottom-mon.top), state.mmi.ptMaxTrackSize.y), state.mmi.ptMinTrackSize.y);
posx = mon.right-wndwidth;
posy = mon.top+(mon.bottom-mon.top)/3-wndheight/3;