97 lines
2.6 KiB
Lua
97 lines
2.6 KiB
Lua
-- @docclass
|
|
UIImageView = extends(UIWidget)
|
|
|
|
function UIImageView.create()
|
|
local imageView = UIImageView.internalCreate()
|
|
imageView.zoom = 1
|
|
imageView:setClipping(true)
|
|
return imageView
|
|
end
|
|
|
|
function UIImageView:getDefaultZoom()
|
|
local width = self:getWidth()
|
|
local height = self:getHeight()
|
|
local textureWidth = self:getImageTextureWidth()
|
|
local textureHeight = self:getImageTextureHeight()
|
|
local zoomX = width / textureWidth
|
|
local zoomY = height / textureHeight
|
|
return math.min(zoomX, zoomY)
|
|
end
|
|
|
|
function UIImageView:getImagePosition(x, y)
|
|
x = x or self:getWidth() / 2
|
|
y = y or self:getHeight() / 2
|
|
local offsetX = self:getImageOffsetX()
|
|
local offsetY = self:getImageOffsetY()
|
|
local posX = (x - offsetX) / self.zoom
|
|
local posY = (y - offsetY) / self.zoom
|
|
return posX, posY
|
|
end
|
|
|
|
function UIImageView:setImage(image)
|
|
self:setImageSource(image)
|
|
local zoom = self:getDefaultZoom()
|
|
self:setZoom(zoom)
|
|
self:center()
|
|
end
|
|
|
|
function UIImageView:setZoom(zoom, x, y)
|
|
local posX, posY = self:getImagePosition(x, y)
|
|
local textureWidth = self:getImageTextureWidth()
|
|
local textureHeight = self:getImageTextureHeight()
|
|
local imageWidth = textureWidth * zoom
|
|
local imageHeight = textureHeight * zoom
|
|
self:setImageWidth(imageWidth)
|
|
self:setImageHeight(imageHeight)
|
|
self.zoom = zoom
|
|
self:move(posX, posY, x, y)
|
|
end
|
|
|
|
function UIImageView:zoomIn(x, y)
|
|
local zoom = self.zoom * 1.1
|
|
self:setZoom(zoom, x, y)
|
|
end
|
|
|
|
function UIImageView:zoomOut(x, y)
|
|
local zoom = self.zoom / 1.1
|
|
self:setZoom(zoom, x, y)
|
|
end
|
|
|
|
function UIImageView:center()
|
|
self:move(self:getImageTextureWidth() / 2, self:getImageTextureHeight() / 2)
|
|
end
|
|
|
|
function UIImageView:move(x, y, centerX, centerY)
|
|
x = math.max(math.min(x, self:getImageTextureWidth()), 0)
|
|
y = math.max(math.min(y, self:getImageTextureHeight()), 0)
|
|
local centerX = centerX or self:getWidth() / 2
|
|
local centerY = centerY or self:getHeight() / 2
|
|
local offsetX = centerX - x * self.zoom
|
|
local offsetY = centerY - y * self.zoom
|
|
self:setImageOffset({x=offsetX, y=offsetY})
|
|
end
|
|
|
|
function UIImageView:onDragEnter(pos)
|
|
return true
|
|
end
|
|
|
|
function UIImageView:onDragMove(pos, moved)
|
|
local posX, posY = self:getImagePosition()
|
|
self:move(posX - moved.x / self.zoom, posY - moved.y / self.zoom)
|
|
return true
|
|
end
|
|
|
|
function UIImageView:onDragLeave(widget, pos)
|
|
return true
|
|
end
|
|
|
|
function UIImageView:onMouseWheel(mousePos, direction)
|
|
local x = mousePos.x - self:getX()
|
|
local y = mousePos.y - self:getY()
|
|
if direction == MouseWheelUp then
|
|
self:zoomIn(x, y)
|
|
elseif direction == MouseWheelDown then
|
|
self:zoomOut(x, y)
|
|
end
|
|
end
|