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100 lines
2.7 KiB
Lua
100 lines
2.7 KiB
Lua
-- @docclass
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UIImageView = extends(UIWidget, "UIImageView")
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function UIImageView.create()
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local imageView = UIImageView.internalCreate()
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imageView.zoom = 1
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imageView.minZoom = math.pow(10, -2)
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imageView.maxZoom = math.pow(10, 2)
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imageView:setClipping(true)
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return imageView
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end
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function UIImageView:getDefaultZoom()
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local width = self:getWidth()
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local height = self:getHeight()
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local textureWidth = self:getImageTextureWidth()
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local textureHeight = self:getImageTextureHeight()
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local zoomX = width / textureWidth
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local zoomY = height / textureHeight
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return math.min(zoomX, zoomY)
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end
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function UIImageView:getImagePosition(x, y)
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x = x or self:getWidth() / 2
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y = y or self:getHeight() / 2
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local offsetX = self:getImageOffsetX()
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local offsetY = self:getImageOffsetY()
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local posX = (x - offsetX) / self.zoom
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local posY = (y - offsetY) / self.zoom
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return posX, posY
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end
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function UIImageView:setImage(image)
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self:setImageSource(image)
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local zoom = self:getDefaultZoom()
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self:setZoom(zoom)
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self:center()
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end
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function UIImageView:setZoom(zoom, x, y)
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zoom = math.max(math.min(zoom, self.maxZoom), self.minZoom)
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local posX, posY = self:getImagePosition(x, y)
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local textureWidth = self:getImageTextureWidth()
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local textureHeight = self:getImageTextureHeight()
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local imageWidth = textureWidth * zoom
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local imageHeight = textureHeight * zoom
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self:setImageWidth(imageWidth)
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self:setImageHeight(imageHeight)
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self.zoom = zoom
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self:move(posX, posY, x, y)
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end
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function UIImageView:zoomIn(x, y)
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local zoom = self.zoom * 1.1
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self:setZoom(zoom, x, y)
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end
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function UIImageView:zoomOut(x, y)
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local zoom = self.zoom / 1.1
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self:setZoom(zoom, x, y)
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end
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function UIImageView:center()
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self:move(self:getImageTextureWidth() / 2, self:getImageTextureHeight() / 2)
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end
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function UIImageView:move(x, y, centerX, centerY)
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x = math.max(math.min(x, self:getImageTextureWidth()), 0)
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y = math.max(math.min(y, self:getImageTextureHeight()), 0)
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local centerX = centerX or self:getWidth() / 2
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local centerY = centerY or self:getHeight() / 2
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local offsetX = centerX - x * self.zoom
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local offsetY = centerY - y * self.zoom
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self:setImageOffset({x=offsetX, y=offsetY})
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end
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function UIImageView:onDragEnter(pos)
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return true
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end
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function UIImageView:onDragMove(pos, moved)
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local posX, posY = self:getImagePosition()
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self:move(posX - moved.x / self.zoom, posY - moved.y / self.zoom)
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return true
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end
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function UIImageView:onDragLeave(widget, pos)
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return true
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end
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function UIImageView:onMouseWheel(mousePos, direction)
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local x = mousePos.x - self:getX()
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local y = mousePos.y - self:getY()
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if direction == MouseWheelUp then
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self:zoomIn(x, y)
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elseif direction == MouseWheelDown then
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self:zoomOut(x, y)
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end
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end
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