130 lines
3.5 KiB
Go
130 lines
3.5 KiB
Go
// Copyright 2017 The Walk Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build windows
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package walk
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import (
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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)
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func init() {
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Resources.rootDirPath, _ = os.Getwd()
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Resources.bitmaps = make(map[string]*Bitmap)
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Resources.icons = make(map[string]*Icon)
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}
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// Resources is the singleton instance of ResourceManager.
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var Resources ResourceManager
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// ResourceManager is a cache for sharing resources like bitmaps and icons.
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// The resources can be either embedded in the running executable
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// file or located below a specified root directory in the file system.
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type ResourceManager struct {
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rootDirPath string
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bitmaps map[string]*Bitmap
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icons map[string]*Icon
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}
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// RootDirPath returns the root directory path where resources are to be loaded from.
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func (rm *ResourceManager) RootDirPath() string {
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return rm.rootDirPath
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}
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// SetRootDirPath sets the root directory path where resources are to be loaded from.
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func (rm *ResourceManager) SetRootDirPath(rootDirPath string) error {
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path, err := filepath.Abs(rootDirPath)
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if err != nil {
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return err
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}
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rm.rootDirPath = path
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return nil
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}
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// Bitmap loads a bitmap from file or resource identified by name, or an error if it could not be
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// found. When bitmap is loaded, 96dpi is assumed.
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//
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// Deprecated: Newer applications should use BitmapForDPI.
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func (rm *ResourceManager) Bitmap(name string) (*Bitmap, error) {
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return rm.BitmapForDPI(name, 96)
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}
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// BitmapForDPI loads a bitmap from file or resource identified by name, or an error if it could
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// not be found. When bitmap is loaded, given DPI is assumed.
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func (rm *ResourceManager) BitmapForDPI(name string, dpi int) (*Bitmap, error) {
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if bm := rm.bitmaps[name]; bm != nil {
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return bm, nil
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}
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if bm, err := NewBitmapFromFileForDPI(filepath.Join(rm.rootDirPath, name), dpi); err == nil {
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rm.bitmaps[name] = bm
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return bm, nil
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}
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if bm, err := NewBitmapFromResourceForDPI(name, dpi); err == nil {
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rm.bitmaps[name] = bm
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return bm, nil
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}
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if id, err := strconv.Atoi(name); err == nil {
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if bm, err := NewBitmapFromResourceIdForDPI(id, dpi); err == nil {
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rm.bitmaps[name] = bm
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return bm, nil
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}
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}
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return nil, rm.notFoundErr("bitmap", name)
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}
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// Icon returns the Icon identified by name, or an error if it could not be found.
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func (rm *ResourceManager) Icon(name string) (*Icon, error) {
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if icon := rm.icons[name]; icon != nil {
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return icon, nil
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}
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if icon, err := NewIconFromFile(filepath.Join(rm.rootDirPath, name)); err == nil {
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rm.icons[name] = icon
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return icon, nil
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}
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if icon, err := NewIconFromResource(name); err == nil {
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rm.icons[name] = icon
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return icon, nil
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}
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if id, err := strconv.Atoi(name); err == nil {
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if icon, err := NewIconFromResourceId(id); err == nil {
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rm.icons[name] = icon
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return icon, nil
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}
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}
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return nil, rm.notFoundErr("icon", name)
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}
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// Image returns the Image identified by name, or an error if it could not be found.
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func (rm *ResourceManager) Image(name string) (Image, error) {
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if icon, err := rm.Icon(name); err == nil {
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return icon, nil
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}
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if bm, err := rm.Bitmap(name); err == nil {
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return bm, nil
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}
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return nil, rm.notFoundErr("image", name)
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}
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func (rm *ResourceManager) notFoundErr(typ, name string) error {
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path := filepath.Clean(filepath.Join(rm.rootDirPath, name))
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return newError(fmt.Sprintf("neither %s resource '%s' nor file '%s' could be found or the image format is not supported", typ, name, path))
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}
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