Remove FindSDL2 find-module, use sdl2-config.cmake instead This requires SDL >= 2.0.4. Since <https://bugzilla.libsdl.org/show_bug.cgi?id=2464> was fixed in SDL 2.0.4, SDL behaves as a CMake "config-file package", even if it was not itself built using CMake: it installs a sdl2-config.cmake file to ${libdir}/cmake/SDL2, which tells CMake where to find SDL's headers and library, analogous to a pkg-config .pc file. As a result, we no longer need to copy/paste a "find-module package" to be able to find a system copy of SDL >= 2.0.4 with find_package(SDL2). Find-module packages are now discouraged by the CMake developers, in favour of having upstream projects behave as config-file packages. This results in a small API change: FindSDL2 used to set SDL2_INCLUDE_DIR and SDL2_LIBRARY, but the standard behaviour for config-file packages is to set <name>_INCLUDE_DIRS and <name>_LIBRARIES. Use the CONFIG keyword to make sure we search in config-file package mode, and will not find a FindSDL2.cmake in some other directory that implements the old interface. In addition to deleting redundant code, this avoids some assumptions in FindSDL2 about the layout of a SDL installation. The current libsdl2-dev package in Debian breaks those assumptions; this is considered a bug and will hopefully be fixed soon, but it illustrates how fragile these assumptions can be. We can be more robust against different installation layouts by relying on SDL's own CMake integration. When linking to a copy of CMake in a non-standard location, users can now set the SDL2_DIR or CMAKE_PREFIX_PATH environment variable to point to it; previously, these users would have used the SDL2DIR environment variable. This continues to be unnecessary if using matching system-wide installations of CMake and SDL2, for example both from Debian.

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3

import Hedgewars.Engine 1.0

Item {
  id: element
  property alias button1: button1
  property alias previewImage: previewImage
  property alias gameButton: gameButton
  width: 1024
  height: 800
  property alias netButton: netButton
  property alias tickButton: tickButton
  property alias gameView: gameView

  ColumnLayout {
    anchors.fill: parent

    RowLayout {
      Layout.alignment: Qt.AlignHCenter

      Button {
        id: button1
        text: qsTr("Preview")
      }

      Button {
        id: gameButton
        text: qsTr("Game")
      }

      Button {
        id: tickButton
        text: qsTr("Tick")
      }
    }

    Rectangle {
      border.color: "orange"
      border.width: 5
      radius: 5

      Layout.minimumHeight: 256
      Layout.fillWidth: true

      gradient: Gradient {
        GradientStop {
          position: 0
          color: "lightblue"
        }
        GradientStop {
          position: 0.9
          color: "blue"
        }
        GradientStop {
          position: 0.9
          color: "darkblue"
        }
        GradientStop {
          position: 1.0
          color: "darkblue"
        }
      }

      Image {
        id: previewImage

        anchors.fill: parent
        anchors.margins: parent.radius
        source: "qrc:/res/iconTime.png"
        fillMode: Image.PreserveAspectFit
        cache: false
      }
    }

    GameView {
      id: gameView

      Layout.fillWidth: true
      Layout.fillHeight: true
    }
  }

  Button {
    id: netButton
    text: qsTr("Net")
    anchors.bottom: parent.bottom
    anchors.bottomMargin: 8
    anchors.left: parent.left
    anchors.leftMargin: 8
  }
}