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---------------------------------------------------------------------------
--- Mouse snapping related functions
--
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2008 Julien Danjou
-- @submodule mouse
---------------------------------------------------------------------------
local aclient = require("awful.client")
local resize = require("awful.mouse.resize")
local aplace = require("awful.placement")
local wibox = require("wibox")
local beautiful = require("beautiful")
local color = require("gears.color")
local shape = require("gears.shape")
local cairo = require("lgi").cairo
local capi = {
root = root,
mouse = mouse,
screen = screen,
client = client,
mousegrabber = mousegrabber,
}
local module = {
default_distance = 8
}
local placeholder_w = nil
local function show_placeholder(geo)
if not geo then
if placeholder_w then
placeholder_w.visible = false
end
return
end
placeholder_w = placeholder_w or wibox {
ontop = true,
bg = color(beautiful.snap_bg or beautiful.bg_urgent or "#ff0000"),
}
placeholder_w:geometry(geo)
local img = cairo.ImageSurface(cairo.Format.A1, geo.width, geo.height)
local cr = cairo.Context(img)
cr:set_operator(cairo.Operator.CLEAR)
cr:set_source_rgba(0,0,0,1)
cr:paint()
cr:set_operator(cairo.Operator.SOURCE)
cr:set_source_rgba(1,1,1,1)
local line_width = beautiful.snap_border_width or 5
cr:set_line_width(beautiful.xresources.apply_dpi(line_width))
local f = beautiful.snap_shape or function()
cr:translate(line_width,line_width)
shape.rounded_rect(cr,geo.width-2*line_width,geo.height-2*line_width, 10)
end
f(cr, geo.width, geo.height)
cr:stroke()
placeholder_w.shape_bounding = img._native
placeholder_w.visible = true
end
local function build_placement(snap, axis)
return aplace.scale
+ aplace[snap]
+ (
axis and aplace["maximize_"..axis] or nil
)
end
local function detect_screen_edges(c, snap)
local coords = capi.mouse.coords()
local sg = c.screen.geometry
local v, h = nil
if math.abs(coords.x) <= snap + sg.x and coords.x >= sg.x then
h = "left"
elseif math.abs((sg.x + sg.width) - coords.x) <= snap then
h = "right"
end
if math.abs(coords.y) <= snap + sg.y and coords.y >= sg.y then
v = "top"
elseif math.abs((sg.y + sg.height) - coords.y) <= snap then
v = "bottom"
end
return v, h
end
local current_snap, current_axis = nil
local function detect_areasnap(c, distance)
local old_snap = current_snap
local v, h = detect_screen_edges(c, distance)
if v and h then
current_snap = v.."_"..h
else
current_snap = v or h or nil
end
if old_snap == current_snap then return end
current_axis = ((v and not h) and "horizontally")
or ((h and not v) and "vertically")
or nil
-- Show the expected geometry outline
show_placeholder(
current_snap and build_placement(current_snap, current_axis)(c, {
to_percent = 0.5,
honor_workarea = true,
pretend = true
}) or nil
)
end
local function apply_areasnap(c, args)
if not current_snap then return end
-- Remove the move offset
args.offset = {}
placeholder_w.visible = false
return build_placement(current_snap, current_axis)(c,{
to_percent = 0.5,
honor_workarea = true,
})
end
local function snap_outside(g, sg, snap)
if g.x < snap + sg.x + sg.width and g.x > sg.x + sg.width then
g.x = sg.x + sg.width
elseif g.x + g.width < sg.x and g.x + g.width > sg.x - snap then
g.x = sg.x - g.width
end
if g.y < snap + sg.y + sg.height and g.y > sg.y + sg.height then
g.y = sg.y + sg.height
elseif g.y + g.height < sg.y and g.y + g.height > sg.y - snap then
g.y = sg.y - g.height
end
return g
end
local function snap_inside(g, sg, snap)
local edgev = 'none'
local edgeh = 'none'
if math.abs(g.x) < snap + sg.x and g.x > sg.x then
edgev = 'left'
g.x = sg.x
elseif math.abs((sg.x + sg.width) - (g.x + g.width)) < snap then
edgev = 'right'
g.x = sg.x + sg.width - g.width
end
if math.abs(g.y) < snap + sg.y and g.y > sg.y then
edgeh = 'top'
g.y = sg.y
elseif math.abs((sg.y + sg.height) - (g.y + g.height)) < snap then
edgeh = 'bottom'
g.y = sg.y + sg.height - g.height
end
-- What is the dominant dimension?
if g.width > g.height then
return g, edgeh
else
return g, edgev
end
end
--- Snap a client to the closest client or screen edge.
-- @function awful.mouse.snap
-- @param c The client to snap.
-- @param snap The pixel to snap clients.
-- @param x The client x coordinate.
-- @param y The client y coordinate.
-- @param fixed_x True if the client isn't allowed to move in the x direction.
-- @param fixed_y True if the client isn't allowed to move in the y direction.
function module.snap(c, snap, x, y, fixed_x, fixed_y)
snap = snap or module.default_distance
c = c or capi.client.focus
local cur_geom = c:geometry()
local geom = c:geometry()
geom.width = geom.width + (2 * c.border_width)
geom.height = geom.height + (2 * c.border_width)
local edge
geom.x = x or geom.x
geom.y = y or geom.y
geom, edge = snap_inside(geom, c.screen.geometry, snap)
geom = snap_inside(geom, c.screen.workarea, snap)
-- Allow certain windows to snap to the edge of the workarea.
-- Only allow docking to workarea for consistency/to avoid problems.
if c.dockable then
local struts = c:struts()
struts['left'] = 0
struts['right'] = 0
struts['top'] = 0
struts['bottom'] = 0
if edge ~= "none" and c.floating then
if edge == "left" or edge == "right" then
struts[edge] = cur_geom.width
elseif edge == "top" or edge == "bottom" then
struts[edge] = cur_geom.height
end
end
c:struts(struts)
end
for _, snapper in ipairs(aclient.visible(c.screen)) do
if snapper ~= c then
local snapper_geom = snapper:geometry()
snapper_geom.width = snapper_geom.width + (2 * snapper.border_width)
snapper_geom.height = snapper_geom.height + (2 * snapper.border_width)
geom = snap_outside(geom, snapper_geom, snap)
end
end
geom.width = geom.width - (2 * c.border_width)
geom.height = geom.height - (2 * c.border_width)
-- It's easiest to undo changes afterwards if they're not allowed
if fixed_x then geom.x = cur_geom.x end
if fixed_y then geom.y = cur_geom.y end
return geom
end
-- Enable edge snapping
resize.add_move_callback(function(c, geo, args)
-- Screen edge snapping (areosnap)
if (module.edge_enabled ~= false)
and args and (args.snap == nil or args.snap) then
detect_areasnap(c, 16)
end
-- Snapping between clients
if (module.client_enabled ~= false)
and args and (args.snap == nil or args.snap) then
return module.snap(c, args.snap, geo.x, geo.y)
end
end, "mouse.move")
-- Apply the aerosnap
resize.add_leave_callback(function(c, _, args)
if module.edge_enabled == false then return end
return apply_areasnap(c, args)
end, "mouse.move")
return setmetatable(module, {__call = function(_, ...) return module.snap(...) end})
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